Lots of choices on 321 between Cosby and G'burg. A new one is Smoky mountain premier campground. They are big rig friendly with pull through sites and nice club house and an on site swimming pool. Going over the gap is doable if you remember to down shift for the grades. I see RVs with burned up brakes every time I go thru the gap. People just don't know how to go down hill in an RV. I was behind one guy who never let off his brakes at all and sure enough, smoke starts coming out from behind his rig. He did manage to pull into a lot and still managed to stop too. He was lucky.