The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties. The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages.Used trailer less than or equal to 4,000 lbs. To transfer a Texas titled vehicle, bring in or mail the following to our offices: 1. This transaction is made in the County of. ,. 1. Enter the location of the sale. Please complete a blue comment card and drop in the designated location when you visit our offices, or enter your comments on our new online feedback form. Bill of sale of motor vehicle. In the State of Texas when you sell or transfer a vehicle, you should complete also the optional Bill of Sale form for your safety. I kind of had to come up with a signed Bill of Sale for the trailer.