MIL-PRF-32181, PERFORMANCE SPECIFICATION TRUCK, FORKLIFT, 4,000 AND 6,200 POUND CAPACITY, LOADING, INTERNAL COMBUSTION ENGINE (14 DEC 2004)., This specification covers a commercial, sit-down rider, diesel-engine-driven, counter-balanced forklift truck (hereinafter called the truck). The truck will have a telescopic mast, front wheel drive, power steering, hydraulic brakes, pneumatic tires, and an overhead guard.