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.The form also documents the sale and is the legal receipt. 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. 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. In the state of Florida, a form HSMV 82050 is a notice of sale. Get the buyer, seller, and witnesses to sign the bill. At the bottom of the form, leave spaces for the buyer's and seller's signatures.