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. The California bill of sale form helps individuals document data on a transaction involving the sale, trade, or gift of personal property.Everything can be handled online, and there are two ways you can transfer your car's title. You can do so with Car Registration or with the California DMV. Avoid white-out, scribbles, and strike-throughs.