Motor Vehicle, Mobile Home, Off- Highway or Vessel Description. Year. Learn about Florida Bill of Sale requirements.Get forms and templates to document the sale of items such as cars, boats, horses, firearms, and more. This is the motor number or serial number required for identification purposes. Free Florida Bill of Sale Forms. Customize a bill of sale document to transfer ownership of a vehicle, boat, firearm, or other item. 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. County of Harris. §. Would you like a proof of sale document today?