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A fifth wheel is a coupling that provides a link between the trailer and a truck (or a tractor unit). Fifth wheel may also refer to: Fifth-wheel trailer, a type of travel trailer that is a variant of the tractor-trailer version; Fifth wheel (Brooks Walker), an invention designed to aid parking cars
A fifth-wheel coupling is also referred to as a kingpin hitch and is a smaller version of the semi-trailer "fifth wheel". Though a fifth wheel and a gooseneck trailer look much the same, their method for coupling is different. A fifth wheel uses a large horseshoe-shaped coupling device mounted 1 foot (0.30 m) or more above the bed of the tow ...
Electric trailer brakes On travel trailers and fifth-wheel trailers, usually over a certain weight, a supplemental system of stopping the rig is needed. Within the towing vehicle's cab is a trailer brake device that uses the towing vehicle's 12-volt DC current to apply a current to electrically-operated wheel brakes on the trailer's wheels.
Fifth wheel Trailer: 17 to 40 ft (5.2 to 12.2 m) Uses fifth-wheel coupling centered above rear axle of towing vehicle Folding / Pop-up: Trailer: 8 to 16 ft (2.4 to 4.9 m) With collapsable sides that are stowed during towing Class A (Integrated) Motorhome: 26 to 45 ft (7.9 to 13.7 m) Typically built on heavy-duty truck or bus chassis
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. Fifth wheels were originally not a complete circle and were hand forged.
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Some larger fifth-wheel trailers, usually over 40 feet (12.2 m) in length and 18,000 pounds (8,200 kg) in weight, are pulled by semi-trucks. Fifth-wheel trailers have become increasingly popular since they first became commercially available in the late 1960s.
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