A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller. Customize and Download this "Bill Of Sale With Payment Plan".Looking for a Pennsylvania bill of sale? We provide a free printable form with detailed guidelines and a document maker for custom forms. Selling or transferring ownership of a car, boat or other item of personal property? Easily create, print, and download a Bill of Sale in minutes. 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. Allegheny College offers convenient, flexible ways to satisfy your balance. See how to understand your billing statement and pay your bill.