A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller. When selling a vehicle, the seller must sign and handprint their name on the proof of ownership document.âť– Form MV-1 must be completed and a check or money order payable to the Commonwealth of. How to fill out the Pennsylvania Motor Vehicle Bill of Sale Form? A bill of sale benefits both the seller of a vehicle and the buyer. I Drive Safely will help you understand the importance of a Texas bill of sale. A Pennsylvania motor vehicle bill of sale is evidence of a vehicle's transfer. Use our template to build your vehicle bill of sale.