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CDL Double Triple Trailers Endorsement

Last updated on April 12, 2023

Double and triple trailers are among the types of vehicles that you can operate with a commercial driving license. Both types require specific knowledge and procedures that must be followed when operating. Take a practice test to make sure you are familiar with them. This is an essential step in passing the DMV permit test.

CDL Double and Triple Trailers Practice Tests

Once you have your Class A CDL, you can apply for a CDL double or triple trailers endorsement. These endorsements are relatively easy to obtain, and the exam is usually inexpensive depending on your state. You must have a Class A CDL to get the double triple trailers endorsement. The test will include how to properly couple and uncouple trailers, as well as proper maintenance of multiple trailers.

The doubles or triples endorsement, also known as the “T” endorsement, enables you to drive several trailers in addition to your single-trailer vehicle. This can allow you to make more money per mile than you would if you were only permitted to haul one trailer. However, not all states allow multiple trailers, and some restrict the length or weight of commercial vehicles.

Taking the exam can be stressful, but practicing beforehand will prepare you for success. With practice tests and study guides, you can practice answering the questions you’ll be asked during the exam. Taking the double/triple trailers practice test is a great way to build confidence prior to the big day.

Requirements for CDL Double Triple Trailers Endorsement.

In order to obtain a Double Triple Trailers endorsement each applicant must have knowledge covering:

  • Procedures for assembly and hookup of the units;
  • Proper placement of heaviest trailer;
  • Handling and stability characteristics including off tracking, response to steering, sensory feedback, braking, oscillatory sway, rollover in steady turns, yaw stability in steady turns; and
  • Potential problems in traffic operations, including problems the motor vehicle creates for other motorists due to slower speeds on steep grades, longer passing times, possibility for blocking entry of other motor vehicles on freeways, splash and spray impacts, aerodynamic buffeting, view blockages, and lateral placement.

Source: 49 CFR 383

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