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|  MIL-T-46768D(AT)
* 3.4.4 Axles. Size 21 through 32 trailers shall be of the four-wheel, tandem-axle type.
Size 34 shall be of the six-wheel, tri-axle type. Axle ratings shall be at least equal to the load
imposed on each axle, measured at the ground, with weight distributed as specified in 3.2.6.
* 3.4.5 Wheels, rims and tires. The trailer shall be equipped with wheels or rims, and tires, as
specified herein. The rim and tire ratings shall conform to Tire and Rim Association or
European Tyre and Rim Technical Organisation recommendations for the type and size of tires
furnished. Rim sizes shall be the same for all wheels on the trailer. Tire size and load range (ply
rating) shall be the same for all tires on the trailer. Multi-piece rims shall not be furnished.
When specified (see 6.2), disc type wheels shall be furnished.
* 3.4.5.1 Tires. Tires shall be steel belted radial, tubeless type with highway tread. Tires shall
have a rated capacity at least equal to the load imposed on each tire, measured at each wheel, at
the ground, with the trailer loaded as specified in 3.2.6. Tires shall conform to Tire and Rim
Association or to the European Tyre and Rim Technical Organisation recommendations.
3.4.5.2 Spare tire assembly. A spare tire assembly shall be furnished. The spare tire
assembly shall include an inflated spare tire mounted on the spare wheel or rim. The spare tire
shall be of the same size, tread design, and load range (ply rating) as furnished on the vehicle.
* 3.4.5.3 Carrier for spare tire assembly. A carrier for a spare wheel or rim and tire assembly
shall be installed in a readily accessible location on the vehicle. Threaded fasteners, when used
to secure the spare tire in the carrier, shall be constructed of or plated with corrosion-resistant
material. The carrier shall enable the safe removal and installation of the spare tire assembly
from and to the vehicle and carrier without personnel positioning themselves or any part of their
body under the spare tire assembly. Carrier design shall enable removal or mounting of spare
wheel assembly using only tools specified in 3.4.12.
3.4.6 Brakes.
* 3.4.6.1 Service brakes. The trailer shall be equipped with a 12-volt electric brake system
wired in accordance with 3.4.7.2. Brake linings shall be asbestos free. The system shall include
a manual controller kit for mounting on the dash of the towing vehicle, a controller kit for
synchronizing the trailer electric brakes with the brakes of the towing vehicle, and an emergency
breakaway kit. Kits shall be complete with all necessary parts and installation instructions.
Unless otherwise specified, the synchronizing controller shall be for use with hydraulic brake
equipped towing vehicles. When specified (see 6.2), the synchronizing controller shall be for
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