How to fill out the Maryland Trailer Bill of Sale Form Instructions? The bill of sale should include the sale price, the trailer identification information (make, model, VIN), and the signatures of the buyer and seller.The form lists the trailer's condition and value while recording each person's credentials. Neither party can argue the deal once they sign. 1. Enter the location of the sale. A Maryland motor vehicle bill of sale (Form VR-181) documents the details surrounding the purchase and sale of a vehicle between two or more parties. All vehicles acquired through a private sale will require a notarized bill of sale for registration and titling purposes in the State of Maryland. The MVA provides a Bill of Sale form. Find Maryland Bill of Sale instructions for the sale of a vehicle, boat, horse, firearm, or other valuable property in the state of Maryland. The stress of sorting out your papers won't linger too long with this template!