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A very large trailer that is towed with a pickup truck.

Additional definitions for 'fifth wheel':

fifth wheelA type of trailer hitch, which consists of a horseshoe-shaped plate on a multi-directional pivot, with a locking pin to couple with the kingpin of a truck trailer.
fifth wheelA very large truck trailer; an 18-wheeler.
fifth wheelAnything superfluous or unnecessary.
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"fifth wheel." STANDS4 LLC, 2018. Web. 24 Feb. 2018. <>.

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