We went through the tunnel last year in our 07 42' Allegro bus. The tunnel is 13' 1" in the middle and we are 12' 10" at the top of our air conditioners. For $15 you get two trips through within a week. We didn't come back that way, but it was worth it. They stop you before the tunnel and wait until all of the cars are clear (it's a little over a mile long) then let you through. You feel like you need to duck, but it's fine. Dark in there, but they have a couple of side tunnels cut into it for a little light. We were on our way to Bryce, so it did save us quite a few miles. Part of the adventure