Clearly print or type all information, except signatures. 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.MV-912: Vehicle Bill of Sale (PDF). English. Use this form to show proof of a vehicle ownership transfer through a private sale. Download. Prepare Your RV for Sale; 2. Get an Appraisal; 3. 1. Enter seller and buyer contact information. A New York motor vehicle bill of sale provides proof that a motor vehicle has been legally sold and acquired in the State of New York. A New York motor vehicle bill of sale form (Form MV-912) is a legal document between the seller and the buyer used to transfer legal ownership of your car.