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In 1950 the next generation of tactical trucks were being developed. Sizes were rationalized, with 1 ⁄ 4 and 3 ⁄ 4-ton 4x4s and 2 + 1 ⁄ 2, 5, and 10-ton 6x6s. Trucks were military standard designs, 6x6 trucks used common cabs and similar fender and hood styles. [14]
The M39 series 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled.
In 1949 the US Army set a requirement for a family of extra heavy-duty 10‑ton (9,072 kg) load rated, off-road, 6x6 tactical trucks. Mack's design, influenced by their WWII era NO (7 + 1 ⁄ 2-ton, 6x6 truck), was chosen. Designed as an entire family of trucks, only the semi-tractor and cargo/prime mover were built. 392 M123 were built between ...
The M809 Series 5-ton 6x6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled. Built by AM General, they evolved into the M939 Series.
The safety of the M939 series of trucks has been criticized, especially braking performance and stability when loaded. In 1999 the U.S. Army began retrofitting anti-lock brake systems to the M939 trucks. [24] Until the trucks were modified, they were limited to a 40 mph (65 km/h) top speed by an Army-wide safety order. [citation needed]
An M35A2 cargo truck with a 10,000 pounds-force (44 kN) PTO-driven Garwood front winch is 112 inches (2.8 m) tall, 96 inches (2.4 m) wide and 277 inches (7.0 m) long, and 13,030 pounds (5,910 kg) empty (13,530 pounds (6,140 kg) empty when equipped with the front mount winch, according to dashboard dataplates).
Each standard tracked vehicle is also defined in terms of track width, length, and spacing. Standard wheeled vehicles are designated by the same MLC numbers (4 through 150), which correspond to about 85% of the gross weight in short tons. Each standard wheeled vehicle is defined in terms of gross weight, number of axles, axle spacing, and axle ...
A 20 June 1945 report by the Army Ground Forces Equipment Review Board recommended that all 4‑ton to 6‑ton tactical trucks should be replaced by a single standard 5‑ton (4,536 kg) 6x6 truck series. In 1949 specifications were set and truck manufactures began working on prototypes.