Wife and I stayed at Big Ridge SP in May this year. By no means an RV park. Not sure I would recommend it, really nothing wrong with it just different than we have ever seen a CG. There is no check in area, just drive in, find your site and setup. Reservations required. Sites are paved, kind of close but does have full hook ups. About 40 minutes outside of Knox.
Oh yea and the road to and from the park to the "main road" is interesting to say the least. Tight switch backs but you should be fine we made it with our 33ft 5'er and found bigger units in the park. Good luck!
Big Ridge State Park — Tennessee State Parks