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

   en.wikipedia.org/wiki/M123_and_M125_10-ton_6x6...

   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 ...

3. 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 ...

4. 5-ton 6×6 truck - Wikipedia

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

   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.

5. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   The towing vehicle has a wide coupling plate known as a fifth-wheel coupling bolted onto its chassis, on which the semi-trailer rests and pivots. As the tractor reverses under the trailer, a kingpin under the front of the trailer slides into a slot in the skid plate, and the jaws of the fifth wheel close onto it.

6. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   Modern fifth wheels allow the trailers to slide into the fifth wheel and lock into it very reliably when maintained and serviced properly. The engagement of the king pin into the fifth-wheel locking mechanism is the only means of connection between tractor and trailer; no other device or safety mechanism is used.

7. Dump truck - Wikipedia

   en.wikipedia.org/wiki/Dump_truck

   Also, when dumping loose materials or cobble sized stone, the side dump can become stuck if the pile becomes wide enough to cover too much of the trailer's wheels. Trailers that dump at the appropriate angle (50° for example) avoid the problem of the dumped load fouling the path of the trailer wheels by dumping their loads further to the side ...