Use this form to gather necessary information when you sell your vehicle or vessel. Access bill of sale form templates and learn how to transfer ownership of vehicles, boats, firearms, and other high-value personal items in Washington.The Washington bill of sale form actively commemorates the exchange of a piece of personal property for a dollar amount via a written contract. Create a Washington bill of sale to document the transfer of ownership for vehicles or other personal property. Download the Washington Bill of Sale form to securely document the transfer of property and ensure a smooth, legally compliant transaction. How do I fill this out?