It contains information about the buyer and the seller, a description of the vehicle being sold, and information about the transaction, such as price. Used trailer less than or equal to 4,000 lbs.The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages. Motor Vehicle (DMV) Bill of Sale Form – Conveys the purchase and transfer of an automobile. Motor Vehicle Bill of Sale Relays the details of a transaction involving a used vehicle. Download: PDF, Word (. How to fill out the Texas Vehicle Bill of Sale Form? A Texas Trailer Bill of Sale is a legal document used when transferring ownership of a trailer.