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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