From your link under 5th wheels:
"Fifth-Wheel Trailer. A vehicular unit, mounted on wheels, designed to provide temporary living quarters for recreational, camping, or travel use, of such size and weight as not to require special movement permit(s), of gross trailer area not to exceed 400 sq. ft. (37.2 m2) in the set-up mode, and designed to be towed by a motorized vehicle that contains a towing mechanism that is mounted above or forward of the tow vehicles rear axle."
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