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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 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 ...
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.
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
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]
A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel. Fifth wheels were originally not a complete circle and were hand forged.
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