fifth wheel

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fifth wheel

[¦fifth ¦wēl]
(mechanical engineering)
A coupling device in the form of two horizontal disks that rotate on each other positioned between a tractor and a semitrailer so that they can change direction independently.
References in periodicals archive ?
Commercial vehicles, trailers and fifth-wheel trailers are included in the definition.
The company designs, manufactures and sells high-quality, attractive motorhomes and fifth-wheel trailers under its Dolphin, Sea Breeze and Tropi-Cal brand names, which are distributed to a network of more than 130 independent dealers in 41 states and Canada.
Respondents predicted that consumers will continue to favor travel trailers (50 percent), followed by motorhomes (31 percent) and fifth-wheel trailers (17 percent).