Send bill of sale for boat and trailer in maryland via email, link, or fax. You can also download it, export it or print it out.Find Maryland Bill of Sale instructions for the sale of a vehicle, boat, horse, firearm, or other valuable property in the state of Maryland. A Maryland boat bill of sale is a legal document that provides proof that a watercraft has been legally sold and acquired between a dealer and an individual. 1. Complete all sections with accurate information. The bill of sale should include the sale price, the trailer identification information (make, model, VIN), and the signatures of the buyer and seller.