I think Hershey is a sell out every year (over 10,000 spaces), but you could contact them to see. You do need to be a AACA member to get a space. I've been going there every year since 1973...this year will be my 40th!
The ATHS Tri State Show every year in Winchester, VA held in late September has a truck flea market that might work for truck related stuff.
Mike B
