Try a good dose of heat, followed by a shot of PB Blaster or Kroil, if any is available. Just don't set the truck on fire! Also, try tightening the bolt, then loosening it. Once the thread moves a little either way, it can usually be worked out. Use a good-quality open end wrench like a Snap-On, to keep from rounding off the nut.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!