A Pennsylvania boat bill of sale is a legal document that records the transfer of ownership of a vessel in the State of Pennsylvania. A Pennsylvania boat bill of sale is a document used to demonstrate a finalized transaction between a boat seller and buyer.This form is used to obtain a Pennsylvania Certificate of Title for vehicles not currently titled in Pennsylvania, or which were repossessed (1. ❖ Form MV-1 must be completed and a check or money order payable to the Commonwealth of. A Pennsylvania Trailer Bill of Sale is a critical document that can help protect your legal rights.