New Trailer and Off-Highway Vehicle (OHV) Report of Sale. You need a California Trailer Bill of Sale form to register your trailer with the DMV after purchasing it from a private party.California Bill of Sale Forms (3). A California bill of sale is an official document used to record the sale of personal property between a buyer and seller. The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages. Create an instant bill of sale for your trailer sales without worries with the help of easily guided fields. Edit, sign, and share bill sale trailer online. No need to install software, just go to DocHub, and sign up instantly and for free. Unavailable vehicle registration clearance requirements. Bills of sale, as needed, to complete the chain of ownership.