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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   After all, the purpose of the fifth wheel is to link the tractor and the trailer; indeed, trailers existed before Charles H. Martin introduced the Martin Rocking Fifth Wheel in 1915. At the time, the fifth wheel literally was a wheel that moved with the trailer—unlike today’s technology that secures a kingpin.

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. Fifth wheel (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Fifth_wheel_(disambiguation)

   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; Fifth Wheel Truck Stops, a truck stop chain across Southern Ontario, Canada; The 5th Wheel, an American reality dating show; The Fifth Wheel, a ...

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