Library File Link. 48-2004. Purpose. An Arizona motor vehicle bill of sale is part of the vehicle registration process.You can use our free template to create your document. Everything needed to complete a typical privateparty sale of a vehicle can be completed at AZMVDNow. 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. The document contains information about the buyer and seller, details about the vehicle, the date of the sale, and the price. Use the tips and resources below to help protect yourself and prepare for your next automobile purchase. Click on the topic to learn more. The motor vehicle seller must insert the sales price, nonresident state and Arizona county tax rates and complete all mathematical calculations.