I may remember that place in CC, rode quads there, can’t think of the name… then there was the Pig Farm near Pennsville…Years ago there was a old abounded basin in elk mills cecil county, was not to far from the drag strip, pretty sure its been developed. Your best bet is Schuylkill County, pa all the "free at you own risk" spots have been blocked off or developed.
https://www.rc4x4.org/ or https://www.aoaatrails.com/
Not much but this might help...any suggestions much appreciated