Walker and Justin, yes, it's just up Hwy 30 off 64, just east of the ranger's station. I have known about it for years and stayed there a few times, but had no idea either that it was open year round. It's not quite full hookups at every site, just power with dispersed water every few sites. They do have a nice bathhouse with showers though. Also, it's on the Reserve America system now but only during regular season (probably March -October).
I've stayed at Thunder Rock. It is really cool too. If you go up the mountain from there you can offroad all the way down into the Cohutta Wilderness in Georgia. 2wd capable IIRC, but off the beaten path nonetheless.
I'll have to check out Chilhowee. Thanks for the tip!