Reggie used to run RoversPlus. Haven't spoken to him in years so I'm not sure if he is still in business. PM me if you want his contact, he may have the tool.
There is also a place I've seen several rovers parked out of leaving Gallatin on hwy 109 just south of the river. A quick search found Complete Auto Care.
Find local businesses, view maps and get driving directions in Google Maps.
www.google.com
Everyone else I know there with rovers has older series or defenders.