Mobile Home, Off-Highway Vehicle or Vessel. How do I fill this out?To fill out the Florida Trailer Bill of Sale, gather all necessary information about the seller, buyer, and trailer. The seller and the buyer must fill out sections 1, 2 (if applicable), and section 3 to finalize the deal. 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. Date of Sale: , 20_______. License plate; Decal; Registration certificate. A certificate of title is the proof of ownership to a motor vehicle in the state of Florida. The document also provides evidence of the monetary exchange between a buyer and seller.