Learn about bills of sale in Pennsylvania for vehicles, firearms, animals, etc. When selling a vehicle, the seller must sign and handprint their name on the proof of ownership document.Motor Vehicle Bill of Sale Provides proof of purchase in the private sale of a vehicle. Download: PDF, Word (. Create a free Pennsylvania bill of sale with detailed instructions for selling a car, boat, gun, or other property. The Pennsylvania DMV bill of sale for a motor vehicle, trailer, or boat is a paper account of the essential components surrounding the transaction of a vehicle. This transaction is made in the County of. ,. State of Pennsylvania, on. This article will describe motor vehicle bills of sale utilized in the state of Pennsylvania and examine the registration of vehicles there. A Pennsylvania motor vehicle bill of sale is a document that records the sale and transfer of ownership of a vehicle from a seller to the buyer.