According to RVIA.org, "A Park Model RV (PMRV) is a unique towable RV designed to provide temporary living quarters for recreational, seasonal, camping or travel use. PMRVs (previously referred to as recreational park trailers) are built on a single trailer chassis, mounted on wheels and have a gross trailer area not exceeding 400 square feet in the set-up mode. They are certified by their manufacturers to comply with the American National Standards Institute (ANSI) A119.5 Park Model Recreational Vehicle Standard. PMRVs are most often sited in RV parks or campgrounds for seasonal use. The campground might own the units and rent them to guests, or an individual PMRV owner might site their unit on a space leased from an RV park or campground. PMRVs by definition are not meant to be affixed to real property. PMRVs are neither designed nor intended by their manufacturers to be used as permanent residences."

 

Definition courtesy of www.RVIA.org