Apply. Bill of Sale. Library File Link. 48-2004. Purpose.Seller Name (first, middle, last, suffix). Learn more about a trailer bill of sale in Arizona and why you may need it when registering your trailer. Download in PDF or Word here. An Arizona Bill of Sale for RV Trailer is a formal document used to record the sale or transfer of RV trailers between a seller and a buyer in Arizona. The application requires the owner to provide the Vehicle Identification Number, the trailer's weight including load, and indicate how the trailer will be used.