The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages. If you purchase or sell a trailer, a New York trailer bill of sale can document the transfer of ownership for vehicle registration.1. Enter the date of sale at the top of the form. Use this free form for private transactions. It comes in a printable PDF format, and you can quickly fill it out using your completer. Let's go over when to use a trailer bill of sale, what to include in the bill of sale and where to get an official template. Planning to sell your trailer? Download one of our trailer bill of sale forms and get the job done ✔️ 38 templates available. A bill of sale is a legal document that outlines the purchase of property between a buyer and seller. It commonly includes both parties' information.