Mobile Home, Off-Highway Vehicle or Vessel. An RV Bill of Sale is a legal document that serves as proof of the sale and transfer of ownership of a recreational vehicle (RV) from a seller to a buyer.This document serves as proof of ownership and allows the seller to report the sale to the DMV. The form includes the details of the vehicle. Learn about Florida Bill of Sale requirements. Get forms and templates to document the sale of items such as cars, boats, horses, firearms, and more. In the state of Florida, a form HSMV 82050 is a notice of sale.