CDL License Requirements for 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.


For more complete details and information on obtaining a CDL Double/Triple Trailers Endorsement
please refer to 49 CFR 383.115
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Commercial Drivers License (CDL) Double/Triple Trailers Endorsement
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