This blog post is tailored to help you understand how to draft, why it's necessary, and where you can obtain a Texas bill of sale. A bill of sale benefits both the seller of a vehicle and the buyer.I Drive Safely will help you understand the importance of a Texas bill of sale. A bill of sale in Texas is a legally binding document that records the details of a transaction. Learn about bill of sale laws and requirements for the state of Texas. Get templates for buying and selling high-value items like cars, boats, and firearms. 1. Enter the seller's name and address. County of Harris. §. 1. Enter the names and addresses of the buyer and seller.