Bill of Sale ; Library File Link. An Arizona motor vehicle bill of sale is part of the vehicle registration process.You can use our free template to create your document. Vehicle Identification Number. A bill of sale may or may not be required in Arizona, depending on who is selling the vehicle. 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. Whether you buy a used car from a dealer, a co-worker, or a neighbor, follow these tips to learn as much as you can about the car.