49 C.F.R. § 383.115 Requirements for double/triple trailers endorsement.
Title 49 - Transportation
In order to obtain a Double/Triple Trailers endorsement each applicant must have knowledge covering: (a) Procedures for assembly and hookup of the units; (b) Proper placement of heaviest trailer; (c) 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 (d) 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.
Title 49: Transportation
PART 383—COMMERCIAL DRIVER'S LICENSE STANDARDS; REQUIREMENTS AND PENALTIES
Subpart G—Required Knowledge and Skills
§ 383.115 Requirements for double/triple trailers endorsement.
