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|  MIL-T-62246B(AT)
3.5.1.1 Body construction. Body floor, sides, and front head shall be not less than 10 gage
(0.1345 inch) steel. The front head shall be capable of withstanding a horizontal static load equal
to half the payload capacity of the vehicle without permanent deformation. When the body floor
is constructed in two or more pieces, an automatic seam weld having full penetration without
reinforcement is acceptable. When the seam is hand welded, the underside of the joint shall be
reinforced with 3-inch wide, 8 gage (0.1644 inch) butt plates, welded between crossmembers. A
full-length channel-formed rub rail of minimum width to cover the rear dual tire treads shall be
provided. Not less than two triangular or box-section side braces per side, of not less than
12 gage (0.1046 inch) steel, shall be equally spaced between the body front head and the full box
type rear corner posts, and welded to side plates. The front head sheet shall be formed or
reinforced for rigidity. The body sides shall have pockets provided at each end for insertion of
side boards. The interior of the body shell and side reinforcements shall be welded with
continuous welds. The rub rail shall be attached using continuous welds, or with intermittent
welds for not less than 50 percent of the edge length of contact edges. The body shall have
sloping running boards and sloping horizontal tailgate braces to minimize the buildup of dirt.
3.5.1.2 Body location. The forward face of the body front head shall be located immediately
to the rear of the material sprayer and air compressor unit (see 3.5.2), and shall be a minimum of
35 inches to the rear of the rear face of the cab.
3.5.1.3 Tailgate. The tailgate panel shall be not less than 10 gage (0.1345 inch) steel. The
tailgate shall be double acting, opening from top or bottom. The tailgate shall have support
chains and a tailgate latch operable by a control at the left front corner of the vehicle body. The
tailgate shall be reinforced to prevent deformation under load.
3.5.1.4 Body understructure. Body longitudinal sills, each having a minimum section
modulus equivalent to that provided by a 5-inch by 6.7 pounds per foot channel, shall be
provided to support the hoist load. Not less than six crossmembers, each having a minimum
section modulus equivalent to that provided by a 3-inch by 4.1 pounds per foot channel, shall be
provided to support an evenly distributed load of not less than 10,000 pounds in the body.
Crossmembers shall be welded to the body shell with not less than 4-inch lengths of weld, front
and rear of both ends of each crossmember, and with staggered intermittent welds of not less
than 4-inch lengths, on not more than 12-inch centers. Contact edges of crossmembers with
longitudinal sills, and contact edges of welded reinforcements, shall be welded for not less than
50 percent of the edge length.
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