Well as I said earlier.. my gut tells me the last bidder was a shill bidder.. either the same guy using a different account, or a friend or realitive.
eBay could give a rip less.. they'll probably tell you to use SafeHarbor to file a auction resolution thing.. basically just an automated system to mediate between the two.. useless.
eBay won't even suspend his account unless he has 3 or more complaints for this kind of behavior.
The short end of it is there is nothing you or eBay can do to force this joker to honor your high bid. I guess you could hire a lawyer and take him to court, but short of a court order and a sherrif standing next to you, there probably isn't much you can do to get that truck for that bid.
Now had the guy actually took your money, it would be a little different story.. but since no money has changed hands.. eBay will just give you the run around, and this guy will end up selling it to somebody else.