When selling a vehicle, the seller must sign and handprint their name on the proof of ownership document. A bill of sale is recommended if you're buying a motor vehicle, boat, or livestock.A Pennsylvania bill of sale documents the transfer of ownership of a motor vehicle, boat, gun, or other valuable asset. The Pennsylvania bill of sale form acknowledges the transfer of possession of a piece of personal property for an agreedupon sum of money. This form is used to obtain a Pennsylvania Certificate of Title for vehicles not currently titled in Pennsylvania, or which were repossessed (1. See our free, printable Pennsylvania Vehicle Bill of Sale below. It's available in both PDF and Word formats.