Restrictions on coming through the tunnel if arriving from the east
Zion-Mount Carmel TunnelYou rig specs say it is 2 inches too tall and 7 inches too wide to pass through the tunnel without paying the $15 tunnel permit, which means the rangers have to set the tunnel for one way traffic for when you pass thru. (Width is measured to the outside of your mirrors, or the body including awning, which ever is wider.
From Nov 1 to March 9, you have to make advance arrangements. Hours allowed to pass through are limited.
You might be stuck waiting for a while before they decide to send you, and others, thru.
See the thread in Roads and Routes about the big truck driver who recently tried to go through the tunnel and got stuck.
I would recommend you drive around, rather than deal with the hassles.