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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.

3. Dolly (trailer) - Wikipedia

   en.wikipedia.org/wiki/Dolly_(trailer)

   Heavy full trailer needs to have its own brakes remotely controlled by the prime mover vehicle. Semi-trailer – 1 axle (2 wheels), without the front axle but have a landing gear. Large semi-trailer of truck size is designed for connection via the fifth wheel on the tractor unit or the semi-trailer truck.

4. Tractor unit - Wikipedia

   en.wikipedia.org/wiki/Tractor_unit

   Trailers containing differing cargos can be rapidly swapped between tractors, eliminating downtime while a trailer is unloaded or loaded. Drawbar couplings are also found, particularly in dedicated exceptionally heavy-duty ballast tractors and as a means to connect intermediate fifth-wheel dollies for pulling multiple semi-trailers.

5. 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 ...

6. Terminal tractor - Wikipedia

   en.wikipedia.org/wiki/Terminal_tractor

   A terminal tractor Terminal tractor at the Port of Dover.. A terminal tractor, known in the United States as a shag truck, shunt truck, spotter truck, spotting tractor, yard truck, yard shifter, yard dog, yard goat, yard horse, yard mule, yard jockey, yard spotter, hostler, or mule, is a kind of semi-tractor intended to move semi-trailers within a cargo yard, warehouse facility, or intermodal ...

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

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

   The M15A2 was the trailer that the M123 was intended to tow. It had a higher load plate and larger coupling pin than a standard semi-trailer. 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.