Zion and Mt Carmel Tunnel?

It is not the tunnel with the problem with length. It is the switch backs on the west side dropping down into the canyon. Even shorter then fifty will drag there hitches and some MHs drag their bumpers. Take the switch back wide and be right close to the center line on right turns and the outside fog line on left turns.
There is no one checking at the base of the canyon eastbound.
Nothing to worry about!

Yes, we have gone through a couple of times now , the last time 3 months ago with the RV. These pictures are of another RV going through. There is a $15 fee.
They stop the traffic one one end of the tunnel and let RV's plus other vehicles
enter from the other side. The instruction for the RV's is to drive in the middle
of the tunnel,where it's the highest, following the center line. The tunnel is 1.1 miles, so sunglasses off, headlights on. We towed our car thru this year , but our total lenght was under 50 feet.

I got thru once going from west to east without having to disconnect. I guess I was just lucky. I know that going from east to west they make you abide by the 50 foot length limit.

You have to unhook the tow. They run traffic one way for you.

Been through several times.
A little un-nerving to drive down the center of the road.
No problems. You may need to wait a few minutes.
If you have a toad, you may most likely will have to have navigator drive it down into the canyon. Fairly strict on the 50 max length.