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|  MIL-W-52125B
the longitudinal centerline of the semitrailer. The lunette and towbar shall be compatible for
towing with military, 5-ton, 6 x 6, M51 dump truck (MS500010) or with a military, 10-ton, 6 x 6,
M123 truck-tractor (MS500070) and shall permit the centerline of the truck to be at an angle of
not less than 60 degrees to the right or to the left of the centerline of the dolly when in towing
position. There shall be no interference between either the truck or the dolly-semitrailer
combination.
3.15.2.3 Landing leg. The towbar of the dolly shall be provided with an adjustable gear type
landing leg to permit one man to couple and uncouple the lunette and the pintle on the towing
vehicle with the dolly loaded. Ground clearance shall be not less than 18 inches when the towbar
and landing leg are in travel position.
3.15.2.4 Dolly suspension. The dolly suspension shall include two dual-tired axles as
specified in 3.14.2 and 3.14.3 in a single point equalizing tandem axle configuration. The
location of the flexible members of the suspension system shall be between the axle and the dolly
fifth wheel plate in a manner to provide the oscillation specified herein without hazardous
handling characteristics. Tires rims, and wheels shall be interchangeable with those on the
semitrailer. A complete air brake system shall be furnished as specified in 3.14.5. The dolly
brakes shall be correctly balanced in application pressure and timing to reduce the possibility of
jackknifing the unit during stops. The dolly brakes shall have less effectiveness than the rear
unit brakes through use of smaller chambers or by installation of a pressure holding or reducing
valve in the dolly brake system.
3.15.2.5 Dolly electrical system. The electrical system of the dolly shall conform to 3.14.6
through 3.14.6.3. Service and blackout rear combination lights, only, shall be required and
installed.
3.15.2.6 Dolly intervehicular connections. The dolly shall be provided with electrical and
airbrake lines to connect the truck systems to the semitrailer systems. All forward intervehicular
connections between the dolly and the truck shall extend 36 to 42 inches toward the truck and
terminate on the dolly towbar rearward at least 18 inches, measured from the center of the lunette
eye. All rearward intervehicular connections between the dolly and the semitrailer shall be
supported on a truck-tractor type spring pole. The intervehicular connection shall have a
minimum length of 10 feet, measured from the dolly frame to the connectors and shall allow the
dolly to turn as specified in 3.15.2.2. Plug clips and rigid mount dummy couplings, shall be
mounted on the dolly and spring pole to hold both the forward and the rearward intervehicular
connections during temporary storage and travel, when not in use. Electrical and airbrake
components shall be as specified in 3.14.1.3 and shall include hose spring guards and dust covers
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