Highway 9 tunnel east of Zion

We went through last fall (year ago) with Ford F 250 crew cab with travel trailer 27 feet, and had no prob. They will hold up the other side and you go through the middle of the tunnel because it's higher there. If you are lower, then they don't have to stop oncoming traffic and you can go through two way. But most likely sounds like you will go through one way (they stop the other side). They are used to this and have it down to a fine science.

I high recommend it and get ready when you exit because the views will be beyond spectacular. This alone is worth the effort of making this trip.