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. How do I fill this out?This form is used to obtain a Pennsylvania Certificate of Title for vehicles not currently titled in Pennsylvania, or which were repossessed (1. This is typically one of the first items you'll put on the bill of sale. The buyer and seller should meet at a notary, tag service, or motor vehicle dealer to ensure the title application is completed correctly. A bill of sale is recommended if you're buying a motor vehicle, boat, or livestock.