Thanks Michael.
I found a great place in Pigeon Forge,
Pine Mountain RV Park. It is up the road behind Shoney's. Paved sites, grass, a nice little creek you can camp on. It has a pool, but you can also use the pool and lazy river at the hotel across the street (at least you could in 2016). The only problem is the distance to TGSMNP.
I saw there are several places on 321 going east out of Gatlinburg. Twin Rivers, Camp LeConte Luxury Outdoor Resort, Camping in the Smokies, Greenbrier Campground. I didn't drive out that way and Google street view doesn't show too much.
Townsend would be great if we only wanted to do park stuff. We drove through that way when we went over to Hwy 129 to run the Dragon (in the dually

- think Ken Black in very slow motion. And Yes, you can drift a dually

) I think Townsend would be a little far from the shopping and the strip in Gatlinburg for DW and DS.
It will probably be another year before we get back to the Smokies. Next year is The DIS Meet and we are going back to St Thomas in June. Not sure how much time DW can take off work.
j