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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The semi-trailer increased the capacity of trucks, but it was the fifth wheel that brought the flexibility for drivers to keep moving while receivers unloaded the loads they just delivered. The Fruehauf Trailer Corporation helped to make the Martin Rocking 5th Wheel a success by installing them on their popular new semi-trailer design. August ...

3. M809 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M809_series_5-ton_6×6_truck

   All M809 models had a rear pintle hitch and could tow 15,000 lb (6,800 kg) trailers except the M816, which could tow 20,000 lb (9,100 kg) The M818 and M819 could tow 37,500 lb (17,000 kg) semi trailers on their fifth wheel. Many M809 series were equipped with a front-mounted 20,000 lb (9,100 kg) capacity winch, intended for self-recovery.

4. M939 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M939_series_5-ton_6×6_truck

   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]

5. 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/5-ton_6×6_truck

   Tractor trucks normally tow a 12-ton (24,000 lb (11,000 kg) load rated 4-wheel (two axles) trailer. There are stake/platform, van, tank, and low-bed models. 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 ...

6. M39 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M39_series_5-ton_6×6_truck

   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]

7. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   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 ...