Chapter 1: General Registration Information. 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.A Recreational Vehicle (RV) Bill of Sale is required anytime an RV is sold or transferred between a seller and a buyer. This is typically one of the first items you'll put on the bill of sale. How do I fill this out? Use the following links to complete your First-Time Vehicle registration online. What do I need to complete my DMV tasks at AAA?