You made no mention of a signed contract. I am assuming you have one. If ya don't, get yourself a big jar of spincheter grease, cause it will help the whole bad experience penetrate you easier. The judge will want to see the contract.
Take him to Judge Judy.
Why not send him a bill for 10,000 dollars for your time, etc for getting his truck? Use this as leverage to get your money back as well.
This is a perfect example of whey you don't go in business with a buddy, lend a buddy money, or take a hired buddy's word at face value. Many people are married to the dollar sign first, relationships second.
Good Luck. Nice touch on the website, becareful he don't sue you for defemation.