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Towing speed and trailing ability |
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|  MIL-T-46768D(AT)
* 3.3.1 Towing speed and trailing ability. While being towed over dry, level, smooth,
improved and prepared hard-surfaced roads at sustained speeds up to 97 kilometers per hour
(km/h) (60 miles per hour (mph)), and over dry, unimproved and gravel roads at speeds to
41 km/h (25 mph), the trailer shall follow the towing vehicle without exceeding the tracking
deviations specified in Federal Motor Carrier Safety Regulation 393.70(a).
3.3.2 Turning ability. When coupled to a towing vehicle operating in its minimum turning
circle, the trailer shall follow without cramping, and shall trail without interference with the
towing vehicle. The trailer shall be capable of moving through an angle of not less than
60 degrees in relation to a 2440 (96-inch) wide towing vehicle without interference between
vehicles. The angle shall be measured between the longitudinal axis of the trailer and the
longitudinal axis of the towing vehicle at the lunette or ball hitch.
3.3.3 Service brakes. The service brakes shall comply with the performance requirements in
Federal Motor Carrier Safety Regulation 393.52. The trailer brake system shall include an
automatic breakaway feature conforming to Federal Motor Carrier Safety Regulation 393.43(d).
* 3.3.3.1 Automatic actuation. The trailer shall be equipped with an automatically actuated
device to apply the vehicle brakes upon breakaway from the towing vehicle. The breakaway
system shall conform to Federal Motor Carrier Safety Regulation 393.43.
* 3.3.4 Suspension system. The axle, springs, accessories and components of the suspension
system shall withstand the imposed loads without evidence of permanent set, part failure or
malfunctioning under the operating conditions specified.
3.4 Trailer components.
3.4.1 Frame. The frame shall be all steel construction and shall be designed to transport the
weight of the trailer body with all equipment. The frame shall support the body full width.
* 3.4.2 Hitch assembly. Unless otherwise specified (see 3.1.1.4), the trailer shall be equipped
with a standard ball hitch assembly, conforming to SAE J684, complete with mating ball for
installation on the towing vehicle. Anti-sway bar(s) shall be provided. When specified, the
trailer shall be equipped with a lunette coupler ring in accordance with 3.1.1.4.
3.4.3 Suspension. The suspension system and running gear shall have a rated capacity at
least equal to the load imposed on each member, measured at the ground, with the trailer loaded
as specified in 3.2.6.
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