Clearly print or type all information, except signatures. If you purchase or sell a trailer, a New York trailer bill of sale can document the transfer of ownership for vehicle registration.MV-912: Vehicle Bill of Sale (PDF). English. Use this form to show proof of a vehicle ownership transfer through a private sale. Download. Use this free form for private transactions. It comes in a printable PDF format, and you can quickly fill it out using your completer. How do I fill this out? To fill out the Mobile Home Bill of Sale, gather all necessary information about the vehicle and the buyer and seller. A motor vehicle bill of sale is between a buyer and a seller of a car, truck, or motorcycle. It is signed as the last step in the sales process.