Key documents required for title transfer include the original title, a bill of sale, and valid identification. If you don't want those products, just decline to purchase the vehicle or negotiate the price of the products.You will have to sign a purchase contract. When buying a vehicle or equipment for your business, use this Vehicle and Equipment Purchase Agreement to protect yourself from unwarranted liabilities. Download forms from the Tax Assessor-Collector's office. Edit, sign, and share vehicle purchase agreement online. No need to install software, just go to DocHub, and sign up instantly and for free.