Not necessarily an off reading trail but there is a dirt/gravel road that I found last year. If you go down 129 past the Dragon toward Robbinsville, on the right somewhere down there the road goes across a bridge and up into the hills. Pretty cool. I drove it to the end (hiking trail head)
It's called Parson's Branch road. It's a one way road that you can't enter from the Dragon. You have to go to the other end. It has water crossings that can be dangerous after rain. http://www.smokiesadventure.com/smokymountains/explorations/parsons_branch_road.htm