We stayed at Jellystone in Crosby, and Pine Mountain in Pigeon Forge.
Jellystone is not bad if you're up front, but the main area get's packed pretty good. The owner/staff are awesome! We went there with a rental TT before we bought the NT, and the sewer hose was far too short to reach the hole. So the owner snagged some hose/parts from the store and let us use it while we were there :)
Pine Mountain was very nice, and nearly empty when we were there (beginning of February). The grounds looked well kept, and it was a bit quieter than I expected for being nearly right on the main drag.