Not less than 4 additional full width crossmembers on class C vehicles and not less than
5 additional full width crossmembers on class D and E vehicles shall be provided in the area of
the rear bogie. The additional crossmembers may be joined by welding to the normally located
crossmembers in the rear bogie area. Crossmembers shall be reinforced by gusset plates or
brackets at points of attachment to longitudinal sills. 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. Longitudinal sills shall be constructed of structural steel channels
or formed channels. Formed channel sills shall be reinforced within the sill, at each
crossmember or body mounting point, with formed channel reinforcements. Frame members
shall be of a continuous length without splices or joints.
TABLE IX. Framing gages.
US Standard gage No.
Side and end rails
* 3.6.3 Flooring. Flooring shall be safety steel tread plate not less than 1/4 inch in thickness
exclusive of the projections. A medium tread plate pattern shall be furnished. When the body
floor is constructed in two or more pieces, continuous seam welds having full penetration shall
be provided the full length of each seam.
* 3.6.4 Front bulkhead. A full-width removable front bulkhead shall be furnished. The
bulkhead shall be not less than 42 inches in height, measured from the platform floor. The
bulkhead shall be formed or reinforced for rigidity. The bulkhead shall be provided with a
screen window in alinement with the rear window of the truck cab. The screen shall be
corrosion-resistant, of not more than No. 6 mesh, number 20 wire, having a square opening of
0.132 inch. The screen shall be enclosed in a metal frame and secured by screws to the
bulkhead. The screen window shall be covered on the inside with a No. 2 mesh, number 16 wire,
having a square opening of 0.437 inch. The bulkhead stakes shall be on the outside of the
payload area and shall be bolted to the bulkhead. The bulkhead shall be secured in stake pockets
and to the side sections with draw-down type fasteners. Openings for the chassis mounted winch
line or body mounted winch hydraulic lines, if a winch is furnished, shall be provided. The
bulkhead shall be capable of withstanding a horizontal static load equal to one half the payload
capacity of the vehicle without permanent distortion of the bulkhead or its mountings.