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http://www.trade.gov/static/doc_auto_faq_expreg.asp
http://fas.org/spp/starwars/offdocs/itar/p121.htm#C-VII
If the truck doesn't fall under the United State Munitions list it may fall under control of the Commerce Control List...
Welcome to the site
some answers to your questions:
1) Read this thread. Pay close attention to post #111
http://www.steelsoldiers.com/showthread.php?125739-Email-message-from-GL-Stopped-truck-Auctions-
2) Prices may skyrocket due to question #1. No more to be said.
3) If you have to ask...