Vehicles are required to be titled in the buyer's name within 30 days from the date of sale. Odometer Declaration.The Texas bill of sale form verifies the elemental facts of the sale of personal property in exchange for a predetermined compensatory amount. By signing this contract, I choose to purchase the motor vehicle on credit according to the terms of this contract. A vehicle sales agreement is a lawful arrangement summarizing the terms and conditions of a vehicle sale between a customer and a seller.