Trucks over 30' are now banned on the gap.
http://www.sportbikes4hire.com
Owner is Greg, he may or may not remember me. I don't go up there nearly as much as I use to since I moved to Chatty. He is located right near the gap.
http://gsmmotorent.com
Dan is the owner here, he does dual sports. He is in Townsend and you can ride the bike into Cades cove and take the one way primitive road that is the only road that connects directly onto the gap. It's an amazing ride.