Hands down the Smokemont CG up the valley some from Cherokee is our favourite. No power, no WIFI, no TV, no cell service but hey, it is camping the way it is supposed to be complete with a creek running through it. Phone & WIFI works a few miles back down the valley at the visitors center. Cades Cove is a drive to get to with a trailer.
Now if all of the comforts of civilisation are a must, there are plenty of full service, close together site CGs in Gatlinburg, Pigeon Forge & Sevierville. Stayed at River plantation, Sevierville a couple of times. Pool, laundry, 50amp, flat sites, cable anything you might need right there with all of the shopping & glitzy stuff minutes away.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp
40+ night per year overnighter
2007 Alpenlite 34RLR
2006 Chevy 3500 LT, CC,LB 6.6L Diesel
Ham Radio: VP9KL, IRLP node 7995