I've been on both sides of a bad deal. You hold parts or a car for someone that tells you they need a little time to come up with all the money. After more time than you agreed on you contact them, if possible and they tell you "Oh I don't want it any more"?
I've driven as much as 600 miles only to find out a car is a POS, or you can't get a hold of the seller. That is life. Expect less than was promised and you won't be surprised. I never expect to "drive" any Mopar home. I always take my car trailer. If you had shown up with a car trailer you could have made him a low ball offer, if he said yes you could have towed it home.