A completed Application for Texas Title and or Registration (Form 130-U); Applicable fees. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties.1. Enter the date of sale at the top of the form. A Texas Trailer Bill of Sale is a legal document used when transferring ownership of a trailer. Edit, sign, and share TRAILER BILL OF SALE online. No need to install software, just go to DocHub, and sign up instantly and for free.