Vehicle Description – Body Type, Make, Model, Year, and any other information that should be mentioned.Buyer and Seller information – Names and Mailing Addresses.To be legal, it must contain the following: Motor Vehicle Bill of Sale – Adobe PDF, Microsoft Word (.docx) By State This form is legally required to facilitate the transfer of possession and to register the vehicle. The motor vehicle bill of sale form is a written contract between a buyer and seller for the exchange of an automobile for cash, trade, or both.