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This let the truck perform wrecker duties and to load and tow semi trailers. All had a front and rear winch. Oversize 12.00×20 were used, this was the only model to have this size. As a wrecker the boom could support 12,000 lb (5,400 kg), as a tractor the fifth wheel load rating was 15,000 lb (6,800 kg). [7] [19]
The M931 (M932 w/winch) was a semi-tractor used to tow semi-trailers up to 37,500 pounds (17,000 kg). A front-mounted winch was optional. Unlike commercial trucks the fifth-wheel could also pivot side to side, making a more flexible connection to the trailer. Even so, off-road performance was limited. [14]
There is also a 15-ton (30,000 lb (14,000 kg)) low bed trailer, the heaviest possible off-road. A 25-ton (50,000 lb (23,000 kg)) low-bed trailer can be towed on prepared surfaces. [40] [41] Unlike commercial trucks the fifth-wheel can also pivot side to side, making a more flexible connection to the trailer.
The Fruehauf trailer company introduced revolutionary inventions to trucking and transportation with hydraulic dump trailers, bulk tanker trailers, and automatic fifth-wheel couplings among their more than one thousand patents, including the shipping container in 1956. Expanding across the country, Fruehauf had 16 plants and more than 80 ...
Euclid also pioneered the high speed tractor belly dumper. This combined an off-road tractor (with a fifth wheel) and a very large, up to 100-ton capacity, belly dump trailer. This machine, descended from bottom dump wagons drawn by crawler tractors, discharged its load through longitudinal gates in the bottom of the trailer.
The M819 Medium wrecker tractor truck, with an extra long wheelbase, was a wrecker with a fifth wheel mounted behind the boom. This let the truck load and tow semi trailers. Meant for aircraft recovery, they had a smaller body and less equipment than the M816. All had a front winch, the fifth wheel replaced the rear winch.
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