Instructions. The new owner's social security number, taxpayer identification number (TIN), or federal employer identification number (EIN) is required. A New York Trailer Bill of Sale helps streamline the registration process and proves the transfer of ownership if a dispute arises.Clearly print or type all information, except signatures. Use this free form for private transactions. It comes in a printable PDF format, and you can quickly fill it out using your completer. We recently applied for a NJ title for our 2017 Escape 19. The MVC in NJ accepted all of our documents except the bill of sale because it was not notarized. Complete the Questionnaire and Purchaser's Affidavit. You also may have the seller complete the Seller's Affidavit confirming the purchase price. Is a Notary or a "Bill of Sale" Needed?