MIL-PRF-45316J
shifting, or deviating more than 3 inches (in.) (7.62 centimeters (cm)) to either side of the towing
vehicle. The vehicle combination shall be capable of ascending or descending longitudinal
grades up to 40 percent (see 4.6.1.13.1).
3.6.4 Side slopes. The trailer shall follow the towing vehicle without slipping or
upsetting. The trailer shall be operated alternately on side slopes having a 20 percent grade to
the left and right (see 4.6.1.13.2).
3.6.5 Tracking ability. The trailer shall be loaded with 400 gal (1514 L) of water and
operated at applicable rated speeds specified herein. When operated in a straight line on a level,
smooth, paved surface, the path of the vehicle shall not deviate more than 3 in. (7.62 cm) on
either side of the towing vehicle (see 4.6.1.12).
3.6.6 Brakes.
3.6.6.1 Service brakes. Combined service brakes of the loaded trailer and towing vehicle
shall be capable of bringing the combination to a stop within a distance of 30 feet (ft) (9.14 m),
from a speed of 20 mph (32.2 km/h) on dry, smooth and level road, free from loose material.
Application of brakes on both wheels of trailer shall be concurrent (see 4.6.1.14).
3.6.6.2 Automatic brake actuator. The trailer shall be equipped with an automatic
actuating device to apply the trailer brakes upon breakaway from the towing vehicle, maintain
application of the brakes, and hold the trailer stationary on a 20-percent grade for not less than
15 minutes (see 4.6.1.15).
3.6.6.3 Parking brake. The manually operated parking brake shall be capable of
restraining the loaded trailer on a 30-percent grade when coupled to the prime mover in an
ascending or descendant mode (see 4.6.1.16).
3.6.7 Landing device. The manually operated, swing-up, vertically adjustable landing
wheel shall have adequate capacity to support the fully loaded trailer and shall withstand,
without damage, the strains imposed upon it when coupling or uncoupling the towing vehicle
(see 4.6.1.17).
3.6.8 Turning ability. When coupled to the prime mover operating in its minimum
turning circle, the trailer shall follow without cramping and damage to the towed trailer or prime
mover, and without interference between the towed trailer and prime mover (see 4.6.1.18).
3.6.9 Fording. The trailer shall ford hard-bottomed salt or fresh water crossings up to
30 in. (76.2 cm) deep for a period of not less than 15 minutes. All components subject to water
damage shall be sealed or protected from adverse effects due to immersion (see 4.6.1.19).
3.7 Safety chains. The trailer shall be equipped with two safety chains conforming to
Federal Motor Carrier Safety Regulation 393.70.
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