MIL-DTL-62073H(AT)
3.5.7.1.1 Highway (paved) and gravel road operation. The trailer shall be loaded with
the highway rated payload or with a simulated load of equal weight uniformly distributed over
the load area. The trailer shall be towed over relatively level, smooth, improved, and prepared
hard-surfaced roads and gravel roads, at the maximum speeds specified in table I without
damage to the trailer or prime mover. The trailer shall track the towing vehicle without
weaving from side to side of path of the towing vehicle moving in a straight line, and without
swaying laterally to an extent that adversely affects the controllability of the vehicle
combination. There shall be no evidence of wheel/tire imbalance such as would be exhibited by
wheel tramp, hop, or of wheel/suspension misalignment (see 4.6.3.1.1).
3.5.7.1.2 Cross-country operation. The trailer, loaded with rated payload uniformly
distributed over the load area, shall be capable of being towed over unimproved roads, open
fields, rolling hills, and cross-country terrain at average speeds specified in table II without
damage to the trailer or prime mover. The payload shall be distributed so that the proper center
of gravity is established (see 4.6.3.1.1).
3.5.7.1.3 Grade and slope operation. The trailer with mission payload shall be capable
of being towed without slipping or upsetting when ascending or descending longitudinal grades
of not more than 40 percent (%) and when crossing side slopes of not more than 20% (see
4.6.3.1.2).
Braking.
3.5.7.2
3.5.7.2.1 Service brakes. All trailers, except the M979 GEMSS/M113 series
combination, shall be equipped with service brakes. The service brakes shall be in accordance
with FMVSS, CFR 49, chapter 571.121 for air brakes, CFR 49, chapter 571.105 for hydraulic
brakes, and both chapters 571.121 and 571.105 for air-over-hydraulic brakes. The brake linings
shall be of non-asbestos material. The combined service brakes of the trailer and towing
vehicle shall, under all conditions of loading, bring the combination to a positive stop within 35
feet (ft) (10.7 meters (m)) from a speed of 20 mph (32.2 km/h) on a dry, smooth, and level hard
surfaced road, free of loose material (see 4.6.3 and 4.6.3.1.3).
3.5.7.2.2 Automatic brake actuator. The actuator shall automatically apply the trailer
service brakes upon breakaway from towing vehicle in accordance with FMVSS CFR 49,
chapter 571.121, S 5.3.3. The actuator shall maintain the application of brakes holding the
trailer stationary under all loads specified herein for not less than 15 minutes (see 4.6.2.1 and
4.6.3.1.4).
3.5.7.2.3 Parking brake. A manually operated parking brake shall hold the trailer with
cross-country payload on a dry, hard, smooth-surfaced road on a 20% grade while unrestrained
by the towing vehicle at the pintle and headed up or down grade (see 4.6.2.1 and 4.6.3.1.5).
3.5.7.2.4 M1061A1 anti-lock brake system (ABS). Both trailer axles shall be
equipped with anti-lock brake systems (ABS) in accordance with CFR 49.571.121. The ABS
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