Many thanks to you all. We've decided to go from Pigeon Forge to Asheville on I-40, park the coach (actually about 44' long and a tag) and drive the Avalanche up for some sight seeing.
So very many curves and turns, very tight clearances, low clearances, and even if I could do it... I'd probably never be able to take my eyes off the road the whole way and my wife would have freaked out so much that she'd be fried.
Sure appreciate the words of advice.
"Be kind... everyone you encounter in life is fighting battles that you have no awareness of."
• 2016 Newmar Bay Star 3124 w/ 2016 Jeep Wrangler Rubicon Unltd Hard Rock