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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]
The base designation identifies permissible gross vehicle weight and engine power output, the latter figure rounded to the nearest 10 hp (7.457 kW). For example, the HX range model 18.330 has a technically permissible gross vehicle weight rating of 18,000 kg and an engine power output of 326 hp (243 kW).
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.
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 Military Load Classification (MLC) is a system of standards used by NATO to classify the safe amount of load a surface can withstand. Load-carrying capacity is shown in whole numbers for vehicles, bridges, roads, and routes. Vehicles are classified by weight, type, and effect on routes.
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.
The 2.5-ton (4×4) FMTV is designated as the Light Medium Tactical Vehicle (LMTV). The 5-ton (6×6) is designated the Medium Tactical Vehicle (MTV). [6] The FMTV is based on the Austrian Steyr 12 M 18 (4×4) truck, but has been localized to meet a minimum of 50% US content. The original 15 FMTV prototypes were assembled in Austria.
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.