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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. D-value (transport) - Wikipedia

   en.wikipedia.org/wiki/D-value_(transport)

   The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is: T = Weight of towing vehicle including the vertical load on the fifth wheel R = Total weight of the loaded semi-trailer U = Vertical load on the fifth wheel g = Acceleration due to gravity (assumed to be 9.81 m/s 2 )

4. Curtiss Aerocar - Wikipedia

   en.wikipedia.org/wiki/Curtiss_Aerocar

   The Curtiss Aerocar is the first-known production travel trailer built in the US and the first-known production travel trailer in the world to use a fifth wheel coupling. [1] [5] The Curtiss Aerocar was designed on aircraft principles [6] using lightweight materials and aerodynamic styling.

5. Recreational vehicle terms - Wikipedia

   en.wikipedia.org/wiki/Recreational_vehicle_terms

   The fifth wheel coupling or hitch provides the link between a fifth-wheel trailer and the towing truck. Newer fifth-wheel hitches are pivoted in two dimensions to ease hitching up and to give the truck and trailer more freedom of movement together. Some models are called sliding-fifth-wheel hitches because the entire hitch assembly can be ...

6. Towing - Wikipedia

   en.wikipedia.org/wiki/Towing

   The towing source may be a motorized land vehicle, vessel, animal, or human, and the load being anything that can be pulled. These may be joined by a chain, rope, bar, hitch, three-point, fifth wheel, coupling, drawbar, integrated platform, or other means of keeping the objects together while in motion.

7. 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.