Mobile Home, Off-Highway Vehicle or Vessel. • Be sure to fill out a "Notice of Sale" form at the county tax collector's office within 30 days of the sale.The form also documents the sale and is the legal receipt. 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. Seller and buyer's names and addresses, signatures, and date of signing; Sell date and price. Bill of Sale for the Seller of the Vehicle. To register a vehicle that was previously titled out-of-state, complete and sign Form 82040 MV: Application for Certificate of Motor Vehicle Title. 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.