I don't know of anywhere in particular, but there are several places that rent out Jeeps and Hummers in the Gatlinburg/Pigeon Forge area. Contacting a couple of those places may be a good start for ya.

Might try southlandcarjeeprental.com

Let us know of your findings. Good luck!

that looks like lexiton point just out side of Bellevue. I am in Boone trace. Crest hummer is sponsering an outing on May 7th