An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages.Motor Vehicle (DMV) Bill of Sale Form Affirms the information contained in a transaction of a vehicle for a payment amount. You can either apply at your local service office or fill out an application online. Forms on this website are PDFs with fillable fields. Forms should be downloaded to your computer before filling in the fields. These templates typically include all necessary sections, such as buyer and seller information, trailer specifics, price, and signatures. Illinois bill of sale forms are documents that provide information about the sale, purchase, or trade of property. Complete and mail the Notice of Sale form. You should attach a copy of the bill of sale as proof of the purchase price.