I'll take a ride and scope out Sevierville / Pigeon Forge / Gatlinburg campgrounds. I agree with the River Plantation recommendation Debi made.

From my memory I don't recall a lot of camgrounds that are friendly to big coaches in large numbers because in the area the terrain is pretty rugged. River Plantation is located on river bottom land and lays flat. It is a fairly new campground.

It will take a few days, but I'll post the results. The late October dates Ben and Coloradobus mentioned will be the dates I will focus on.

FWIW, this area has a lot of features similar to Branson in that it has theaters, outlet shopping, some great motorcycle riding venues, Dollywood, loads of amusement rides and other types of entertainment like helicopter rides.