We were there for the VA Fall rally this year. We stayed at the KOA in Broadway, VA. It is ok but watch out for the boulders! We had trouble negotiating the rig out of the site.
While we were there Gus and Debra, VA Chapter Leaders, visited the Campground at Endless Caverns and had many good things to say about the facility. You may want you PM Gus for his expertise.