Chuck,
Now you know how us East Coast folks feel about the drive to GOX. We do have some great places to play here if you have balls of steel. Once you factor in the rocks and mud, you have one heckuva combination. A trail that is a level two dry can be an all-bets-are-off trail after a rainstorm. You might as well be crawling Moab in an ice storm. TN and NC are famous for the disgusting clay that slides like WD-40 when you hit it. I can't vouch for PA, but I can vouch for the south.