A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller. A bill of sale is recommended if you're buying a motor vehicle, boat, or livestock.When selling a vehicle, the seller must sign and handprint their name on the proof of ownership document. How to fill out the Pennsylvania Motor Vehicle Bill of Sale Form? 1. Write the vehicle details such as make, model, year, and VIN. 2. See our free, printable Pennsylvania Vehicle Bill of Sale below. It's available in both PDF and Word formats. The Pennsylvania bill of sale form acknowledges the transfer of possession of a piece of personal property for an agreedupon sum of money. Create a free Pennsylvania bill of sale with detailed instructions for selling a car, boat, gun, or other property.