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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 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 M939 is a 5-ton 6×6 U.S. military heavy truck.The basic cargo versions were designed to transport a 10,000 pounds (4,500 kg) cargo load over all terrain in all weather.
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 M1120 HEMTT LHS (Load Handling System) is a M977 Heavy Expanded Mobility Tactical Truck with a load handling system in place of a flat bed/cargo body. The HEMTT is an eight-wheel drive, diesel-powered, tactical truck used by the US military and others.
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.
The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg) tactical truck. [2] The M977 HEMTT first entered service in 1982 with the United States Army as a replacement for the M520 Goer , and since that date has remained in production for the U.S. Army and other nations.