Clearly print or type all information, except signatures. A New York Trailer Bill of Sale helps streamline the registration process and proves the transfer of ownership if a dispute arises.A New York Trailer Bill of Sale form acts as a legal document in New York, stating that a trailer has been sold and purchased. The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages. Use this free form for private transactions. It comes in a printable PDF format, and you can quickly fill it out using your completer. The legal authority for this form is IC 9-17-2-4. Filling out the Trailer Bill of Sale form involves providing accurate information about the trailer and the buyer and seller. Bill of sale section. This system will apply the trailers brakes in the event of a trailer uncoupling while towing.