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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin , a 2-or- 3 + 1 ⁄ 2 -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a ...

3. 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]

4. 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]

5. M123 and M125 10-ton 6x6 trucks - Wikipedia

   en.wikipedia.org/.../M123_and_M125_10-ton_6x6_trucks

   Early M123 had a larger fifth wheel mounted above the frame rails, but as more standard trailers were used, the M123C and all following models had lowered fifth wheels. The pin remained larger, so any trailer towed by any M123 had to have an interchangeable pin. [3] A standardized REO designed cab, also used in the 2 1/2 and 5‑ton trucks, was ...

6. 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 wide ...

7. Tractor unit - Wikipedia

   en.wikipedia.org/wiki/Tractor_unit

   The tractor–trailer combination distributes a load across multiple axles while being more maneuverable than an equivalently sized rigid truck. The most common trailer attachment system is a fifth-wheel coupling, allowing a rapid shift between trailers performing different functions, such as a bulk tipper and box trailer.