The documentation and forms required for titling a vehicle are based on the situation involving the vehicle, as described in the table below. The Trailer is to be sold free and clear of any liens, encumbrances, or mortgages.When buying or selling a trailer in North Carolina, a detailed bill of sale is crucial. Download a North Carolina trailer bill of sale here. Proof of ownership may be a bill of sale, conditional sales contract, out ofstate registration, etc. 4. It is recommended to fill it out before selling and buying a trailer in North Carolina. You should use a document in a printable PDF format. When buying or selling a trailer in North Carolina, a detailed bill of sale is crucial. Download a North Carolina trailer bill of sale here. Create a Website Account - Manage notification subscriptions, save form progress and more.