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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel.

3. Curtiss Aerocar - Wikipedia

   en.wikipedia.org/wiki/Curtiss_Aerocar

   Although the Curtiss Camp Car patent referred to a second forthcoming patent application for a Curtiss-designed fifth-wheel coupling, no such patent was submitted. Images of the Camp Car held in the archives of the Glenn H. Curtiss Museum indicate that the fifth-wheel hitch used was the commercially available Martin Rocking Fifth Wheel.

4. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   A fifth wheel uses a large horseshoe-shaped coupling device mounted 1 foot (0.30 m) or more above the bed of the tow vehicle. A gooseneck couples to a standard 2 + 5 ⁄ 16-inch (59 mm) ball mounted on the bed of the tow vehicle. The operational difference between the two is the range of movement in the hitch. The gooseneck is very maneuverable ...

5. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   A tractor unit pulling a semi-trailer A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle.The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States).

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. Recreational vehicle terms - Wikipedia

   en.wikipedia.org/wiki/Recreational_vehicle_terms

   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 rolled from its forward towing position to a more rearward position for backing up and maneuvering in tight ...