Pa has vehicle inspections and I believe for those areas also emissions inspections too.
I believe only 1 inch of tread is allowed to be beyond your fender flare fyi.
Most are not terribly hard core, but there are alot of trails on state game lands
that are open to 4x4 vehicles, alot are getting gated though, but at least they are free
and are really fun to find, provided you like working with maps.
Paragon and Raush are a BLAST, but Paragon may not exist much longer...