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Truck by Trailer: The History of the Truck Trailer Manufacturing Industry

Mon, 2 Dec 2019 16:34:46 GMT

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About the Book:

The introduction of the truck trailer in the early 1900s revolutionized materials distribution much as had the first steamboats, railroad cars, airplanes, trucks, and intermodal shipping containers. Truck trailers allowed shippers to send much larger loads to customers with the same truck and driver. Trailers could be“spotted” for loading or unloading, then hooked to a truck or tractor, or even loaded onto a railcar or ship,thus allowing drivers and power equipment to be more productive. The fledgling trailer manufacturers adopted the slogan “Truck by Trailer” in 1920. Industry pioneers overcame many obstacles to push the evolution from horse drawn wagons to truck tractors pulling trailers and semi-trailers. Some of the same type operational and regulatory challenges that face dearly trailer builders a century ago remain today.Trailers proved their value during two world wars and those wartime experiences led to engineering and manufacturing advancements that long benefited commercial users.While methods and materials of trailer construction to serve expanding markets have changed over the years, the principle of providing the economy with a versatile and dependable tool for moving materials has remained unchanged.

Truck by Trailer: The History of the Truck Trailer Manufacturing Industry is the first book to recognize the truck trailer as a unique transportation vehicle. It was written to celebrate the truck trailer as part of the celebration of the 75th Anniversary of the Truck Trailer Manufacturer’s Association.

About the Author:

John L. Conley spent 40 years with the trucking industry, including as editor of Modern Bulk Transporter magazine and with the trade association National Tank Truck Carriers Inc., from which he retired as president in 2013. He formed ConleyComm LLC in Chester MD in 2014. He received a Master’s Degree in Journalism from the University of Maryland and is a U.S. Navy veteran.

Lowbed and Heavy Duty Platform Trailer Users Manual

Wed, 17 Nov 2021 20:50:25 GMT

This book includes General Operating Recommendations, Definitions of Various Load Types, Load Distribution, Design Criteria, Nomenclature, and References.

October 2020 Edition

Trailer ID Manual

Wed, 18 May 2016 13:18:08 GMT

Divided into two books. Book 1 contains the most recent VIN decoding information for participating trailer manufacturers from model year 2005 and on. Book 2 contains our previous format of the manual which contains various formats of VIN information that has been collected on model year 2004 and earlier trailers.

Current Edition: October 2014.

RP- 1 Permissible Load Concentration for Straight Floor Van Trailers

Fri, 19 May 2023 19:33:58 GMT

Establishes the minimum design criteria of non-specialized trailers up to 50 ft. in length to carry concentrated loads. It is intended as a guide to carriers and shippers when transporting heavy, concentrated loads to avoid damaging the trailer floor and structural members.

April 2023 Edition

RP- 4 Truck Trailer Landing Gear (Screw Type)

Fri, 3 May 2019 15:38:40 GMT

Provides a suggested hole pattern for trailer landing gear mounting brackets, crank handle location, and landing gear strength rating.

April 2019 Edition

RP- 6 Trailer Hitches and Connections for Interchange Service

Thu, 14 May 2020 20:48:35 GMT

Recommends the performance and physical inter-changeability of mechanical, pneumatic and electrical connections in tractor-trailer combination.

April 2020 Edition.

RP- 9 Location of Lighting Devices for Trailers

Fri, 27 Oct 2023 16:11:28 GMT

Prepared to serve as a practical guide for positioning lighting devices on truck trailers over 80 inches in overall width in accordance with current regulations of the Department of Transportation. Although the drawings do not attempt to illustrate every type of trailer used in commercial service, a variety of types were chosen having different structural details so that the basic concepts might be applied to any specific design. This Recommended Practice is not intended to imply that it conforms to all state regulations. Each state’s regulations if not preempted by Federal Regulations should be complied with in addition to the regulations of the DOT.

October 2023 Edition

RP- 107 TTMA Flange Dimensional Information

Fri, 2 Jun 2023 16:48:11 GMT

This Recommended Practice provides standard dimensions for piping flanges and sump flanges used on cargo tanks to facilitate interchangeability of components if repair or replacement is required.

April 2023 Edition

RP- 12 Trailer Air Brake System Integrity Test

Fri, 27 Oct 2023 16:12:58 GMT

Intended for use in truck trailer production lines as a final air system integrity test before the vehicle is certified as ready for service.

October 2023 Edition

RP- 21 Tank Vehicles In Hot Products Service

Fri, 17 Jun 2022 16:44:30 GMT

Intended to serve as a guide for proper design and construction of non-pressure tank vehicles for transporting asphalts (Bitumens) or other hot commodities of similar characteristics in properly insulated tank vehicles.

April 2022 Edition

RP- 24 Classification of Weld Finishes for Stainless Steel Tank Vehicles

Thu, 29 Apr 2021 20:15:33 GMT

Establishes a uniform classification of weld treatments for use in specification writing.

April 2021 Edition.

RP- 25 Design and Construction of Dry Bulk Pneumatic Trailers

Mon, 30 Apr 2018 18:35:07 GMT

A guide intended for use in designing and operating pneumatic trailers for highway transportation of dry bulk trailers.

April 2018 Edition

RP- 28 Flange And Emergency Valve Dimensional Information

Thu, 14 May 2020 16:29:42 GMT

Provides standard dimensions for cargo tank emergency valve inlet and outlet flanges.

April 2020 Edition

RP- 32 Method For Testing and Evaluating Trailer Steel Leaf Spring Fatigue

Fri, 19 May 2023 19:34:26 GMT

Determines a fatigue life of trailer leaf springs and offers an evaluation of the fatigue test life cycles in order to establish an acceptable minimum “life” standard.

April 2023 Edition

RP- 33 Clean-Out Nipples on Tank Trailers

Fri, 17 Jun 2022 16:45:15 GMT

Promotes uniformity and insures interchangeability of tank clean-out nipples which mate with the straight or tapered internal threads of caps, vents, cleaning equipment, etc.

April 2022 Edition

RP- 35 Permanent Safety Signs/Labels for Truck Trailers and Containers

Fri, 3 May 2019 15:44:43 GMT

Is intended as a guide for the design and display of product safety signs and labels for the protection of personnel and property. Requirements are set forth with the aim of achieving a uniform system to identify hazards for persons using, operating, servicing, or in proximity to, truck trailers and containers.

April 2019 Edition

RP- 36 Tank Trailer and Tank Container Nomenclature

Wed, 17 Nov 2021 20:34:17 GMT

Provides a nomenclature for tank trailer and tank container terms to facilitate communication. The nomenclature provided here is the preferred nomenclature of the majority of the trailer manufacturers.

October 2020 Edition

RP- 37 Rating of Van Trailer and Container Floors for Lift Truck Loading

Wed, 25 May 2016 14:08:44 GMT

Intended for use in determining and describing the strength of floor systems for closed van trailers and containers of monocoque construction in terms of the magnitude of lift truck front axle load that can be carried safely.

RP- 38 Method for Testing and Rating Heat Transmission of Controlled Temper

Mon, 15 Nov 2021 20:12:39 GMT

Establishes standard test methods for determining rates of heat transmission and air leakage of controlled temperature vehicles and domestic containers and to establish a standard heat transmission rating method of controlled temperature vehicles and domestic containers.

October 2021 Edition

RP- 39 Method for Determining GAWR and GVWR for Truck Trailer Certification

Fri, 3 May 2019 15:39:49 GMT

Describes a method for determining the Gross Axle Weight Rating (GAWR) based on the load-carrying capacity of the axle/wheel assembly components and the Gross Vehicle Weight Rating (GVWR) based on a uniformly distributed payload. Also describes a method for determining the GAWR and GVWR for the certification label prescribed by Title 49, Code of Federal Regulations, Part 567 (49 CFR 567).

April 2019 Edition

RP- 41 Splash Guard Attachments Where Mounting Holes Are Required

Mon, 17 Oct 2022 19:45:51 GMT

Establishes the hole size and locations for mounting 24 inch wide splash guards in order to facilitate replacement.

September 2022 Edition

RP- 44 Air Brake Application and Release Test

Fri, 18 Oct 2019 19:24:25 GMT

Establishes a procedure and test set up for production line testing and inspection of truck trailer air brake systems to determine compliance with requirements established by Federal Motor Vehicle Safety Standard S. 121 Air Brake Systems.

September 2019 Edition

RP- 45 Vapor Collection for MC 306 and DOT 406 Cargo Tanks

Fri, 3 May 2019 15:40:40 GMT

Establishes recommendations for vapor collection systems to be used with MC 306 and DOT 406 cargo tanks which are bottom loaded. (Reference TTMA R.P. No. 46)

April 2019 Edition

RP- 46 Bottom Loading MC 306 and DOT 406 Cargo Tanks

Mon, 15 Nov 2021 19:52:56 GMT

Establishes recommendations for the design characteristics of MC 306 and DOT 406 Cargo Tanks that would be equipped with bottom loading systems.

October 2021 Edition

RP- 47 Testing, Rating, & Labeling Platform & Van Trailers for Cargo Securement

Fri, 3 May 2019 15:41:24 GMT

Establishes test procedures and general performance specifications for tiedown anchor points, front-end structures, and sidewall structures. Doors are not considered cargo securement devices. Trailers manufactured on and after January 1, 2002 should be constructed in accordance with this R.P.

April 2019 Edition

RP- 49 FMVSS 121 Trailer Testing & Certification

Fri, 3 May 2019 15:45:33 GMT

Establishes minimum testing procedures for operational aspects of trailer air brake systems as integrated assemblies of trailers, as well as establishes requirements for certification of components relative to performance, the combination of which will allow trailer manufacturers to certify as required by FMVSS 121.

April 2019 Edition

RP- 51 Auxiliary Air Systems

Fri, 3 May 2019 15:42:24 GMT

Serves as a practical guide for the inter-connection of air systems for auxiliary equipment with the air brake systems of truck trailers, container chassis and converter dollies.

April 2019 Edition

RP- 53 U. S. Trailer Certification Label

Mon, 15 Nov 2021 20:11:11 GMT

Describes the information required by the National Highway Traffic Safety Administration (NHTSA) which must be placed on the information label of a newly manufactured trailer requiring no further manufacturing operations to perform its intended function other than the addition of readily attachable components such as tire and rim assemblies or minor finishing operations such as painting.

October 2021 Edition

RP- 54 Work on Cargo Tanks Which May Have Been in Combustible Service

Fri, 18 Oct 2019 19:26:33 GMT

Establishes recommended safety precautions applicable to work on cargo tank motor vehicles which have handled flammable or combustible materials.

September 2019 Edition

RP- 55 Trailer Entry Securement

Fri, 19 May 2023 19:34:55 GMT

Intended as a guide for general design and installation of hardware for a trailer entry closing system to deter and to provide visible evidence of unauthorized entry into the trailer.

April 2023 Edition

RP- 56 Trailer Vehicle Identification Number

Mon, 15 Nov 2021 20:09:29 GMT

Describes the Vehicle Identification Number which must be placed on trailers according to 49 CFR 565 and 571.115 (Federal Motor Vehicle Safety Standard No. 115.) This Recommended Practice does not cover every detail of the federal regulations. 49 CFR 565 and 571.115 should be referred to for the legal require-ments of the VIN. A sample VIN code format is shown, but other code formats may be equally acceptable.

October 2021 Edition

RP- 57 Avoid Placement of Girth Seams in Voids on Self Supporting Tanks

Wed, 17 Nov 2021 20:37:13 GMT

Explains why girth seams should not be located in voids on self supporting tanks.

October 2021 Edition

RP- 58 FMVSS 121 Brake Requirements For Lowbed and Specialized Trailers

Fri, 19 May 2023 19:35:20 GMT

Intended as a guide to the Federal Motor Safety Standard (FMVSS 121) air brake system requirements for lowbed and other specialized trailers.

April 2023 Edition

RP- 59 Tank Trailer Ladders And Walkways

Fri, 19 May 2023 19:40:35 GMT

Intended to serve as a guide for the uniform design and construction of ladders and walkways on liquid cargo tanks only.

April 2023 Edition.

RP- 61 Performance of Manhole Assemblies on 306/406 & Non-ASME 312/412 Tanks

Wed, 17 Nov 2021 20:39:53 GMT

Intended to serve as a guide for the design, construction, and testing of manhole and fill opening covers installed on DOT specification MC 306 and DOT 406 Cargo Tanks.

October 2020 Edition

RP- 62 Vibration Evaluation of Spring Brake Chamber on a Trailer Axle mounting

Wed, 17 Nov 2021 20:35:53 GMT

Establishes a uniform test procedure to provide maximum design criteria to mount spring brake chambers on trailer axles. The procedure is intended to verify the structural integrity of both the spring brake chamber mounting area and the mounting bracket of the trailer axle.

October 2021 Edition

RP- 64 Rolling Tail Pipes

Thu, 14 May 2020 16:27:22 GMT

Defines and shows location of rolling tail pipes.

April 2020 Edition

RP- 65 ‘Stretch’ Van Trailers for Over-the-Road Service

Fri, 27 Oct 2023 16:14:04 GMT

Establishes applicable design and minimum testing procedures for ‘stretching’ van trailers for over-the-road service. It is not the intent of this Recommended Practice to provide a salvage system for damaged or junk trailers.

October 2023 Edition

RP- 66 Trailer Nomenclature

Thu, 14 May 2020 16:28:41 GMT

Provides a nomenclature of trailer terms to facilitate communication and define terms used in other TTMA Recommended Practices and Technical Bulletins.

April 2020 Edition

RP- 67 Rating of Platform Trailer Floors for Lift Truck Loading

Fri, 17 Jun 2022 16:46:41 GMT

Intended for use in determining and describing the strength of a platform trailer in terms of the magnitude of lift truck front axle load which can safely be carried.

April 2022 Edition

RP- 68 Urethane Foam Flammability and Safety Measures - Safety Sign/Label

Fri, 19 May 2023 19:35:47 GMT

Caution Signs – Serves as a guide to establish a caution sign regarding urethane foam flammability and safety measures.

April 2023 Edition

RP- 71 Trailer Axle Alignment

Fri, 18 Oct 2019 19:29:13 GMT

Intended as a guide for the alignment of axles on newly manufactured and rebuilt trailers. It describes one procedure for measuring trailer axle alignment with simple tools. Other more sophisticated procedures are also acceptable.

September 2019 Edition

RP- 72 Trailer Converter Dolly

Thu, 14 May 2020 16:27:59 GMT

Lists the requirements and recommendations for trailer converter dollies.

April 2020 Edition

RP- 73 Static Grounding or Bonding of Cargo Tanks in Flammable Service

Thu, 29 Apr 2021 20:23:01 GMT

Serves as a guide in the design and placement of external grounding studs and the internal bonding of the components such as capacity indicators and high level sensors on MC 306 tank trailers to reduce the hazard of static electrical sparks during loading and unloading.

April 2021 Edition.

RP- 77 Baffle Emergency Drain Cut Outs for Cargo Tanks

Fri, 3 Dec 2021 19:34:28 GMT

Describes the need for and provides a guide to the location of auxiliary, emergency, baffle drain openings used to facilitate pumping off a baffled cargo tank which has overturned on its side or top.

October 2021 Edition

RP- 78 Reinforcing Members on Steel Tanks Where Thickness Testing is Precluded

Mon, 20 Mar 2023 15:07:03 GMT

Intended as a guide to the design of circumferential reinforcements on lined MC 307, MC 312, DOT 407 and DOT 412 cargo tank vessels used for the transportation of corrosive materials and fabricated from mild and high tensile steels.

April 2022 Edition

RP- 80 Drive Shaft Protection on Trailers

Fri, 18 Oct 2019 19:27:52 GMT

Serves as a guide for installing power takeoff (PTO) shaft guards on tank trailers. The Practice only describes areas of the PTO assembly that should be protected and does not recommend specific guard design.

September 2019 Edition

RP- 81 Performance of Spring Loaded Pressure Relief Valves on Cargo Tanks

Mon, 30 Apr 2018 18:32:41 GMT

Intended as a guide for determining the reseating capability of MC 306, MC 307, MC 312, DOT 406, DOT 407 and DOT 412 cargo tank pressure relief valves in a rollover condition.

April 2018 Edition

RP- 83 Leak Testing Newly Mfg'd DOT 406 Cargo Tanks and Cargo Tank V/R Systems

Wed, 17 Nov 2021 20:38:31 GMT

Establishes procedures for the manufacturer’s testing of newly manufactured DOT 406 cargo tanks and cargo tank vapor recovery systems.

October 2020 Edition

RP- 84 Emergency Valve Shear Device Impact Test Procedure

Wed, 3 Mar 2021 16:33:30 GMT

Intended as a guide for performing impact tests on emergency valves to show conformance with 49 CFR 178.345-8(b)(2) which states: “The failure of the sacrificial device must leave the protected lading retention device or part and its attachment to the tank wall intact and capable of retaining product.”

April 2020 Edition.

RP- 86 Emergency Valve Shear Section Strength Calculations

Thu, 29 Apr 2021 20:24:26 GMT

Recommends an acceptable method for calculating the strength of shear sections on Emergency Valves in accordance with 49 CFR 178.345-8(b)(2) and is intended for emergency valves protected by a shear section.

April 2021 Edition.

RP -87 DOT 400 Series Cargo Tank Rollover Protection

Fri, 27 Oct 2023 16:16:12 GMT

Shows several rollover accidents damage protection configuration and methods for calculating the strength of the protection. This RP does not provide methods for calculating local stresses.

October 2023 Edition

RP- 90 Side Turn Signal Lamps For Long Trailers

Fri, 19 May 2023 19:36:08 GMT

Recommends placement of side turn signal lamps on trailers longer than 45 feet (13.72 meters) to help alert motorists of impending turns by tractors pulling long semitrailers.

April 2023 Edition

RP- 93 Trailer Conspicuity Systems

Mon, 15 Nov 2021 20:07:42 GMT

Serves as a guide for installing trailer retro-reflective sheeting and/or reflectors in accordance with current conspicuity system regulations of 49 CFR 571.108 (FMVSS 108). This R.P. does not apply to pole trailers and converter dollies, trailers with a GVWR 10,000 pounds or less, trailers with a width of less than 80 inches and trailers manufactured exclusively for use as offices or dwellings.

October 2021 Edition

RP- 94 Pressure Test Qualification of Structural Integrity 406 & LowP 412 Tanks

Wed, 31 Oct 2018 20:04:53 GMT

Recommends a pressure proof test as an alternative to the calculated integrity of a cargo tank per 49 CFR 178.345(b), static pressure, and 178.345-8(e), longitudinal deceleration protection.

October 2018 Edition

RP- 96 Structural Integrity of DOT 406, 407 and 412 Cylindrical Cargo Tanks

Mon, 15 Nov 2021 19:57:55 GMT

Recommends acceptable methods of calculating the structural integrity of DOT 406, DOT 407, and DOT 412 cylindrical cargo tanks in conformance with 49 CFR 178.345-3 and 178.345-8(e).

October 2021 Edition

RP- 97 Trailer Antilock Braking System Wiring

Thu, 29 Apr 2021 20:13:54 GMT

Specifies a method of wiring the antilock braking system (ABS) on a trailer intended to be used on public roads. This R.P. is compatible with TTMA T.B. No. 119 “Electrical Interface for Truck-Trailer Inter-connection.” T.B. 119 provides the minimum design requirements for the cables, plugs, and receptacles for the truck-trailer interconnection.

April 2021 Edition.

RP- 98 Cargo Tank to Truck Chassis Attachment

Fri, 17 Jun 2022 16:46:00 GMT

Provides items for consideration and recommendations for the mounting and attachment of cargo tanks to truck chassis by cargo tank manufacturers, distributors and re-mounters.

April 2022 Edition

RP-100 Determination of Trailer Length and Width

Wed, 17 Nov 2021 20:41:21 GMT

Serves as a guide to the length and width limits of commercial trailers in truck tractor-semitrailer, truck tractor-semitrailer-trailer, and truck tractor-semitrailer combinations operating on the National Network.

October 2020 Edition

RP-101 Verification of Finite Element Analysis

Fri, 2 Jun 2023 16:46:30 GMT

Recommends that the results from linear and nonlinear finite element analysis (FEA) be verified by some means.

April 2023 Edition

RP-102 Vapor Recovery Line Configurations for 407 & 412 Cargo Tanks

Mon, 15 Nov 2021 20:05:54 GMT

Establishes standard configurations for vapor recovery lines on DOT 407 and DOT 412 cargo tanks. These configurations provide for top (on the tank) and bottom (near the tank outlet) vapor recovery. This RP is not intended to address the retrofit of vapor recovery systems on existing cargo tanks.

October 2021 Edition

RP-103 Trailer Tracking Installation

Fri, 19 May 2023 19:41:56 GMT

Provides guidance for system component sizes and arrangement, interfacing and mounting for trailer tracking systems intended for dry van semi-truck trailers. Specific components (hardware) and features, and actual operation of the individual devices are not covered by this recommended practice.

April 2023 Edition

RP-104 OEM Trailer Prep. for Systems Using High Voltage Cables

Mon, 17 Oct 2022 19:44:52 GMT

Provides minimum safety guidelines and requirements for the trailer OEM to protect HV cable mounted in or on truck trailers and to provide guidance on labeling concerning Equipment and HV electrical installations.

September 2022 Edition

RP-105 CTRMC Vision 2020 for Common Common Tank Trailer Ladders, etc.

Fri, 3 May 2019 15:43:26 GMT

Suggests a ladder and walkway configuration for certain new tank trailers. Both carriers and people planning facilities for these trailers can optimize around this configuration.

April 2019 Edition

RP-106 Common Connections for Chemical Cargo Tanks

Thu, 29 Apr 2021 20:25:30 GMT

This Recommended Practice establishes standard configurations for connections on DOT 407 cargo tanks for chemical transportation.

April 2021 Edition.

RP-108 California Proposition 65 Warning Label for Trailers

Tue, 4 Jun 2019 20:01:54 GMT

Briefly explains California's Proposition 65 law and recommends a warning label to enable manufacturers to secure safe-harbor against enforcement actions under the Prop. 65 "Clear and Reasonable Warnings".

June 2019 Edition.

RP-109 Trailer Ground Clearance

Mon, 15 Nov 2021 20:39:28 GMT

This RP provides a uniform method for calculating the location of the minimum vertical ground clearance for rigid auxiliary equipment – such as fuel tanks, storage boxes, side-door steps, tire carriers, lift gates – that may be affixed underneath the semi-trailer without contacting the ground when the trailer goes over a change in grade, including grade changes attributable to loading docks, railroad crossings, steep driveways, and the like. This RP assumes that the auxiliary devices will not adversely interact or interfere with the normal workings of the trailer. Even though a generic van trailer is depicted, the same method may be adapted to other semi-trailers.

September 2019 Edition.

RP-110 ID Marks for Nozzle Cap Threads

Thu, 29 Apr 2021 20:20:51 GMT

This Recommended Practice establishes clear and easy to see common markings to all NPT and BSP caps.

April 2021 Edition.

RP-111 Cargo Tank Maximum Load and Unload Rate

Mon, 15 Nov 2021 20:22:36 GMT

This Recommended Practice is intended to serve as a guide for the proper marking of maximum load and unload rates on the cargo tank Specification Plate as prescribed under 49 CFR 178.345-14(c).

October 2021 Edition

RP-112 Dry Bulk Ladders - Special Considerations

Fri, 19 May 2023 19:25:16 GMT

This Recommended Practice is intended to serve as a guide for the uniform design and construction of ladders on dry bulk tank trailers.

April 2023 Edition

TB- 57 Guidelines on When to Use Stabilizing Devices on Semitrailers

Fri, 3 May 2019 15:47:34 GMT

Emphasizes the potential danger of trailer nose diving or tail diving under certain conditions of loading and unloading and provides guidelines for reducing this danger by the use of stabilizing devices whenever the trailer is not supported by a tractor or converter dolly.

April 2019 Edition

TB- 58 Cargo Tank Venting

Wed, 17 Nov 2021 20:43:47 GMT

Emphasizes the importance of proper venting to operators and to describe equipment problems that may result from inadequate venting.

October 2021 Edition

TB- 60 Corrosion Prevention for Aluminum Tanks

Mon, 17 Oct 2022 19:44:02 GMT

Advises users of means of corrosion prevention for aluminum tanks.

September 2022 Edition

TB- 61 Preheating of Stainless Steel Tanks

Thu, 14 May 2020 16:44:06 GMT

Advises operators of possible problems which may be encountered when preheating empty tanks.

April 2020 Edition.

TB- 65 Wiring Diagram for Truck Trailers

Mon, 30 Apr 2018 18:35:43 GMT

Illustrates a typical wiring diagram for truck trailers.

April 2018 Edition

TB- 70 Spring Parking and Emergency Brakes on FMVSS 121 Equipped Trailers

Fri, 19 May 2023 19:27:49 GMT

Emphasizes the reasons that spring brakes are installed on most trailers and the potential hazards that occur if the trailer is operated with the spring brakes caged or if servicing is attempted without caging the brakes.

April 2023 Edition

TB- 71 Fifth Wheel Pick-Up Ramps for Truck Trailers

Thu, 14 May 2020 16:42:52 GMT

Establishes a guide for the design of tractor pick-up ramps.

April 2020 Edition.

TB- 74 End Dump Trailer Operation

Fri, 17 Jun 2022 16:43:27 GMT

Provides guidance for safe operation of end dump trailers.

April 2022 Edition

TB- 75 Hot Products Tank Vehicles

Mon, 17 Oct 2022 19:43:08 GMT

Suggests accepted operating procedures for hot product tank vehicles.

September 2022 Edition

TB- 76 Dry Bulk Receiving Piping Recommendations

Fri, 27 Oct 2023 16:19:07 GMT

Emphasizes the importance of good piping practices for dry bulk pneumatic trailer receiving installation.

October 2023 Edition

TB- 77 Cracked or Broken Main Beams on a Platform Trailer

Fri, 27 Oct 2023 16:17:46 GMT

Provides guidance for repairs to the main frame beams of a platform trailer that is cracked or broken.

October 2023 Edition

TB- 78 Upper Coupler Attachment Fasteners for Van Type Trailers

Mon, 30 Apr 2018 18:37:22 GMT

Establishes a guide for replacement of missing, damaged or loose upper coupler attachment fasteners on van trailers. It is of vital importance that attachment fasteners be replaced when damaged to insure safe operation of the trailer.

April 2018 Edition

TB- 79 Repair and Replacement of Damaged Body Members on Van Trailers

Wed, 17 Nov 2021 20:48:08 GMT

Provides guidance for replacement or repair of van trailer main structural components for sheet & post and fiberglass reinforced plywood (FRP) side wall designs.

October 2020 Edition

TB- 80 Specification Cargo Tank Vehicle Usage

Fri, 19 May 2023 19:29:11 GMT

Suggests accepted operating procedures in the proper usage of MC 306, MC 307, MC 312, DOT 406, DOT 407 and DOT 412 cargo tank motor vehicles.

April 2023 Edition

TB- 83 Pneumatic Tank Vehicle Usage

Fri, 18 Oct 2019 19:45:23 GMT

Suggests accepted operating procedures in the proper usage of Pneumatic Tank Vehicles.

September 2019 Edition

TB- 84 Tractor Air Supplies for Pneumatic Trailers

Wed, 17 Nov 2021 20:46:38 GMT

Suggests features that should be incorporated when an air supply system is installed on a tractor.

October 2020 Edition

TB- 86 Modification of Used Vans for Hauling Wood Chips

Fri, 3 May 2019 15:48:19 GMT

Establishes certain guidelines for consideration when altering used closed vans for hauling wood chips, shavings, and related forest products to various mills, and to provide certain structural criteria for safe operation.

April 2019 Edition

TB- 87 Loading Suspeded Cargo

Fri, 19 May 2023 19:28:33 GMT

Provides a guide for loading and operating suspended cargo trailers such as meat rail and garment trailers so proper vehicle stability will be maintained and rollover hazard reduced.

April 2023 Edition.

TB- 88 Broken Wood Floorboard Repair

Fri, 3 May 2019 15:49:04 GMT

Provides guidelines for repairing broken floorboards in trailers when the floor construction is of wood and is supported by and fastened directly through cross-members.

April 2019 Edition

TB- 89 Sliding Undercarriage Retention

Fri, 3 May 2019 15:49:53 GMT

Provides information, which will aid in the proper maintenance and safe operation of sliding under-carriages.

April 2019 Edition

TB- 92 Maintenance of MC 306 ad DOT 406 Manhole and/or Fill Assemblies

Fri, 19 May 2023 19:29:37 GMT

Provides guidelines for the inspection and maintenance of MC 306 and DOT 406 cargo tank manhole and/or fill assemblies.

April 2023 Edition

TB- 94 Loading and Use of Lowbed and Industrial Trailers

Thu, 29 Apr 2021 20:27:03 GMT

Provides some general information about the loading and use of lowbed trailers.

April 2021 Edition.

TB- 95 Trailer Specification

Wed, 17 Nov 2021 20:44:57 GMT

Offers a basic specification for new trailers, which may be adopted to purchase specifications.

October 2021 Edition

TB- 96 ID of Openings in Voids & V/R Systems Prior to Repairing Insulated Tanks

Fri, 19 May 2023 19:29:58 GMT

Serves to emphasize the importance of properly identifying inspection openings and drains in voids and vapor return systems prior to cleaning and repairing MC 306, MC 307, DOT 406, DOT 407 and insulated tank vehicles.

April 2023 Edition

TB- 97 Urethane Foam Flammability and Safety Measures

Mon, 30 Apr 2018 18:38:00 GMT

Defines minimum precautionary measures, which should be taken to avoid fire and smoke when repairing foamed trailers.

April 2018 Edition

TB- 99 Disposition of Spring Brake Chambers

Thu, 14 May 2020 20:58:56 GMT

Provides a warning of potential danger in disposing of used or damaged spring brake chambers.

April 2020 Edition.

TB-101 Corrosion in General Purpose Stainless Steel Tanks

Fri, 27 Oct 2023 16:22:44 GMT

Points out some known factors which can cause corrosion problems in general purpose stainless steel tanks. This corrosion may show up as staining, pitting, etching, and/or stress corrosion cracking.

October 2023 Edition

TB-102 Op. & Maint. of MC 306 and DOT 406 Cargo Tank Bottom Loading Systems

Mon, 30 Apr 2018 18:40:18 GMT

Provides recommendations for the operation, maintenance, and safety of MC 306 and DOT 406 cargo tanks that are equipped with bottom loading systems.

April 2018 Edition

TB-103 Liquid and Vapor Control During Loading/Unloading

Fri, 18 Oct 2019 19:44:33 GMT

Advises operators of the potential fire hazard from spills and health hazard from vapors associated with loading and unloading MC 307 & DOT 407 tanks, and recommendations on ways to alleviate these potential problems.

September 2019 Edition

TB-104 Dimensions Affecting Interchange of Van & Platform Double Trailers

Fri, 27 Oct 2023 16:21:41 GMT

Provides guidance for operators and manufacturers in ordering and designing doubles trailers which may be interchanged with other similar equipment. Establishes guidelines for total combinations so that they may be satisfactorily and legally operated within the latest published size limitations for interstate and designated highways.

October 2023 Edition

TB-105 Safe Use of MC 306 and DOT 406 Cargo Tank Vapor Collection Systems

Thu, 29 Apr 2021 20:31:36 GMT

Points out the design limitations, operational characteristics and safety considerations for a MC 306 or DOT 406 specification cargo tank subjected to conditions created by vapor collection systems during loading and unloading operations.

April 2021 Edition.

TB-108 Spread/Steering Axle Specialty Trailers

Fri, 17 Jun 2022 19:30:34 GMT

Describes the proper and productive use of lowbed and other specialty trailers equipped with spread/ steering axles.

April 2022 Edition

TB-109 Pressure Supply Manifold for Unloading Tank Vehicles

Thu, 1 Nov 2018 15:42:32 GMT

Establishes requirements for the air or gas supply manifold for permanent installation at an unloading site where a high-pressure supply is used to pressure unload tank trailers designed for low-pressure unloading.

October 2018 Edition

TB-110 Upper Coupler Attachment Bolts for Trailers with Repositionable UCs

Fri, 2 Jun 2023 16:51:07 GMT

Establishes a guide for determining the number of upper coupler bolts on trailers using a repositionable bolted upper coupler arrangement. It provides a guide for field inspections to establish the adequacy of the bolting on a trailer.

April 2023 Edition

TB-111 Electrical System Maintenance and Repair for Trailers

Fri, 19 May 2023 19:32:06 GMT

Intended as a guide for general maintenance and repair of trailer electrical systems other than those with sealed wiring harnesses. Use of this Technical Bulletin does not in any way relieve the user of the necessity of complying with Federal Motor Carrier Safety Regulations or applicable state and local motor vehicle regulations.

April 2023 Edition

TB-113 Thickness Testing of Unlined Cargo Tanks in DOT Service

Fri, 18 Oct 2019 19:46:38 GMT

Establishes inspection methodology that conforms with the minimum requirements of 49 CFR 180.40(i), and illustrates one method of conducting a thickness test on a cargo tank vessel. This method meets the minimum requirement of the regulation. Other methods of conducting thickness testing may be equally acceptable.

September 2019 Edition

TB-114 Wheel-End Separations

Fri, 3 May 2019 15:46:48 GMT

Advises operators of the dangers that occur if axle hubs and/or wheels of trailers separate due to improper maintenance procedures.

April 2019 Edition.

TB-115 Transportation of Food Grade Products in Dry Bulk Trailers

Fri, 19 May 2023 19:30:31 GMT

Provides guidelines for the transportation of food grade products in aluminum dry bulk (pneumatic) trailers.

April 2023 Edition

TB-116 Determination of MC 300 Series Cargo Tank Minimum Thickness

Thu, 14 May 2020 16:43:30 GMT

Aids design certifying engineers, enforcement officials, and registered inspectors in determining the minimum thickness of MC 306, MC 307, and MC 312 cargo tanks when performing the test mandated by 49 CFR 180.407(i).

April 2020 Edition.

TB-117 Orientation of PAF Manholes with Integral Hinged 10 in Fill Style PRVs

Fri, 19 May 2023 19:31:02 GMT

Provides guidelines for the orientation of manhole with integral hinged 10 inch fill style emergency pressure relief valves/fills on MC 306 and DOT 406 cargo tanks.

April 2023 Edition

TB-118 Transportation of Liquid Food Products

Mon, 15 Nov 2021 20:24:45 GMT

Offers advice and suggestions on the transportation of liquid food products.

October 2021 Edition

TB-119 Electrical Interface for Truck-Trailer Interconnection

Thu, 29 Apr 2021 20:28:37 GMT

Informs vehicle manufacturers, component suppliers, and carriers of the recommended electrical interface for truck-trailer interconnection for truck tractors, trucks designed to pull trailers and trailers equipped with antilock braking systems.

April 2021 Edition.

TB-120 Graphic Illustrations of MC 300 Series Cargo Tanks

Fri, 3 May 2019 15:50:49 GMT

A visual aid illustrating construction details of tank trailers designed to comply with DOT Motor Carrier Tank Specifications MC 306, MC 307, and MC 312 for the carriage of hazardous commodities.

April 2019 Edition

TB-121 Inspection of Unwetted Circumf. Seam Welds where Visual is Precluded

Fri, 2 Jun 2023 16:52:19 GMT

Provides guidance for inspection of the circumferential seam welds within the connecting structure joining multiple cargo tanks where, in a self-supporting cargo tank motor vehicle, external visual inspection is precluded by insulation, jacketing, doubler bands, etc. per FMCSA.

April 2023 Edition

TB-122 Operation of Typical Vapor Recovery Lines on 400-Series Cargo Tanks

Wed, 17 May 2017 18:39:52 GMT

This T.B. is intended to instruct personnel how to operate typical vapor recovery lines on DOT 407 and DOT 412 cargo tanks. These lines conform with TTMA R.P. No. 102.

Current Edition: April 2017

TB-123 Vapor Recovery Retrofit of 307, 312, 407 & 412 Cargo Tanks

Mon, 30 Apr 2018 17:01:02 GMT

Guidelines for the retrofit of vapor recovery equipment on existing chemical and acid cargo tanks. Need for these systems may arise from requests to comply with the EPA’s rule “National Emission Standards for Hazardous Air Pollutants: Organic Liquids Distribution (non-Gasoline)” or other carrier need. Care shall be exercised to familiarize yourself with any particular special needs of the commodity to be carried.

April 2018 Edition

TB-124 Pressure Washing Precautions

Fri, 27 Oct 2023 16:20:28 GMT

Covers the power wash precautions to be taken for the trailer externals only. This bulletin does not address the precautions to be followed for power washing of cargo tank trailers.

October 2023 Edition

TB-125 CTRMC General Ladders and Tank Access Equipment Maintenance

Fri, 27 Oct 2023 16:24:10 GMT

This Technical Bulletin is intended to suggest a general side access ladder configuration for use on new and used one compartment cargo tanks with a capacity of approximately 6000 to 8000 gallons, and a top walkway.

October 2023 Edition

TB-126 Bench Testing Reclosing Pressure Relief Devices

Thu, 29 Apr 2021 20:30:08 GMT

This Technical Bulletin provides guidelines for bench testing reclosing pressure relief valves on DOT specification cargo tanks.

April 2021 Edition.

TB-127 Out of Print MC-300 Construction Regulations 178.340-343

Mon, 15 Nov 2021 20:43:51 GMT

This Technical Bulletin is intended to provide a reference for the older construction codes for MC-306, MC-307 & MC-312 cargo tanks. The codes for these cargo tanks were printed in the Code of Federal Regulations until they were superseded by the DOT-400 specifications. At that time, DOT changed the section of regulations to read “49 CFR 178.340-178.343 - [Reserved].” This electronic-readable version is to support users who find difficulty with DOT's contention that interested persons use old printed copies from certain Federal Libraries if they want to refer to the older codes.

October 2021 Edition

TB-128 Hazardous Materials Definitions and Code References

Mon, 15 Nov 2021 20:42:11 GMT

This Technical Bulletin is intended to provide a definition and code reference for the many Hazardous Materials definitions that one may encounter in the use of a cargo tank. For cargo tank specific terms, see RP-36 Tank Trailer and Tank Container Nomenclature.

October 2021 Edition

TB-129 A User’s Guide to EPA Regulations for Trailers

Wed, 17 Nov 2021 20:52:23 GMT

This Technical Bulletin is to provide an overview to-, and raise awareness of- the EPA’s Regulations for trailers as they apply to trailer buyers, owners and operators.

October 2021 Edition

TB-130 Cargo Tank Pressure Hazards

Fri, 19 May 2023 19:32:43 GMT

This Technical Bulletin is intended to address pressure hazards on cargo tanks. Air pressure is typically
applied to cargo tanks to aid in the unloading process of heavy products off the vessel. Operators should
be aware of the dangers associated with pressure in and around the vessel, the piping, and any device
connected to the vapor space on the vessel.

April 2023 Edition

TB-131 Safe Sampling Protocol

Fri, 27 Oct 2023 16:25:09 GMT

The purpose of this Technical Bulletin is to offer a method for sampling product from a cargo tank that
does not require access to the top of the tank.

October 2023 Edition

TB-132 Warning Decal for Oxygen Deficient Cargo Tanks

Fri, 19 May 2023 19:33:09 GMT

Suggests a warning decal to reduce likelihood of fatalities involving oxygen deficient atmospheres in cargo tanks.

April 2023 Edition

TB-133 Temperature Monitoring of Liqud Cargoes

Fri, 3 May 2019 15:58:22 GMT

Illustrates common types of temperature monitoring equipment employed on tank trailers, explains the pros and cons associated with each, suggest periodic calibration to assure accuracy and discusses heat transfer best practices.

April 2019 Edition

TB-134 Alternative means for Qualifying Registered Inspectors of Cargo Tanks

Thu, 14 May 2020 16:41:19 GMT

Establishes alternative means for the Qualification of RI's to assure the letter and intent of Part 180 is followed in completing tests and inspection, as well as other Part 180 activities, on all DOT Specification cargo tanks.

April 2020 Edition

TB-135 Valve Seat Tightness Check for Pre-Load Verification

Fri, 17 Jun 2022 16:40:01 GMT

Offers a common method for shippers or carriers to verify the bottom outlet valve and piping system integrity prior to loading a typical stainless steel chemical cargo tank.

April 2022 Edition