Seller Name (first, middle, last, suffix). Library File Link. 48-2004. Purpose.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 motor vehicle bill of sale (ADOT Form 48-2004) is a legal document that transfers ownership of a motor vehicle from a seller to the buyer. 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.