Beware of dealing with Mark Nixon

You have a paper trail... it's the emails he sent back to you acknowledging that he owes you for the truck. Print them up and file the small court paperwork.

I have taken several people to small claims court. Just make a short decription of what the deal was and that he didn't pay up. Then after you get a judgement tell him that in a week you will turn it over to a collection agency. They will hound him forever, and you will get about 50%, if he is not smart enough to pay you first. His credit score will take a big hit if you send it to a collection agency.