There are people you can hire!!! Sounds your stuck in a bad place... At this time he owns two boats... Do you have any other documents that he signed showing sales transaction on boat? If you don't, he could legally come trailer that boat away with the help of the police. Cashed checks?(I'm not sure if it was an even trade or trade and monies) Anything that would tie him to receipt of money or trade for the boat? Without that he can just say it was stolen..... title is ownership!!! If you have any ground to stand on, something to back up the transaction as a ligitimate transaction, then go see a lawyer to process it through the courts. Or there are people you can hire...... There is nothing worse than dishonest people, specially when the law protects them!!!! Good luck!!!