We've been going to Trackrock for at least 15 years, first as tenters and eventually with out TT and full hookups. This past summer I organized a family reunion up there and my siblings drove 9-10 hours all the way from lower Alabama, Mississippi, and the Outer Banks. One even flew in from Seattle, just to go to Trackrock!
They have a section in the back that is more suited to tents and pop-ups, with W/E. I've seen some other rigs in there, but it's tight. Most of the other sites are FHU. Some sites are a little uneven--it's on a mountain, after all, but nothing that's ever been too bad. I love site 70 the best. But we've been in 19, 10, 2, and 52 (and probably some I can't remember.)And like a PP said, they have a large area on the top of the mountain that is flat and works well for bigger rigs. Trackrock is a very popular place in the summer and fall. In fact, if you want to camp in October, you better have your reservations made by June.