A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller. The Pennsylvania bill of sale form acknowledges the transfer of possession of a piece of personal property for an agreedupon sum of money.A Pennsylvania bill of sale documents the transfer of ownership of a motor vehicle, boat, gun, or other valuable asset. Vehicle Payment Plan Agreement. A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. See our free, printable Pennsylvania Vehicle Bill of Sale below. It's available in both PDF and Word formats. Learn about bills of sale in Pennsylvania for vehicles, firearms, animals, etc. A bill of sale is a legal document that transfers ownership from a seller to a buyer in exchange for trade. Private Car Sale Installment Agreement ✓ easily fill out and sign forms ✓ download blank or editable online.