Mobile Home, Off-Highway Vehicle or Vessel. The bill of sale serves as a basic requirement for either registering the vehicle or transferring the title of the newly-purchased vehicle.Once you've both filled out a Florida Bill of Sale, follow these next steps for registration of the vehicle: Write out the title with the previous owner. The bill of sale must show the vehicle description including the year, make, and vehicle identification number (VIN). b. Motor vehicles, vessels, mobile homes and trailers must be registered at the point of purchase and a certificate of title issued as proof of ownership. If you've purchased a vehicle from an individual, you will need to apply for registration in order to drive it in Massachusetts legally. A Florida bill of sale is a document used to transfer the ownership of personal property from a seller to a buyer. These documents should include a bill of sale, a promissory note and a loan agreement. Legal Consult Recommended. 1. 1. Fill in the seller's and buyer's full names and contact information.