The bill of sale outlines all the agreed-upon terms of the sale, including purchase price, closing date, and more. It can be used to record the sale of new or used mobile homes with the cost of transportation or lease transfer to be negotiated in a separate document.If you own a mobile home or are looking to purchase one in Texas, having a certificate of title is critical to have to prove ownership. These may include a bill of sale, contract, deed, purchase agreement, or sale receipts. Let's go over the process for buying a mobile home, what to include in the bill of sale and where to get an official template.