All trailers are subject to the same motor vehicle laws as passenger vehicles. They must be titled and if registration is desired, they must be safety inspected (if they are used vehicles).
Alabama Bill of Sale Requirements In general, you may not need a bill of sale when selling a vehicle. However, bills of sale are required by the Department of Revenue (DOR) when you are selling a vehicle with no title. You'll also need to use a bill of sale when registering a vessel, or boat.
An RV Bill of Sale is a legally binding document that helps protect the interests of both the buyer and the seller. It serves as proof of the transaction and transfer of ownership and should be kept as a record by both parties.