I personally love the northern route which follows 89 to 9 and goes through Zion. You will have to wait for an escort to get through the Mt. Carmel tunnel. The scenery is worth the money.
This quote is from Zion National Park.com
"Zion-Mt. Carmel Tunnel Escort
An escort fee is required for vehicles 7'10" wide and/or 11'4" tall or larger which usually includes all RV's, buses, trailers, 5th wheels, dually trucks, and some camper shells. Escorts (rangers) are stationed at both sides of the Zion-Mt. Carmel Tunnel to direct traffic. During winter months, escorts are arranged at the entrance stations. The hours are posted seasonally at kiosks before you enter the park from either direction, but it usually late March through late October, escorts are usually stationed at the tunnel from 8am to 8pm daily and in November the time shortens to 8am to 4:30pm. The fee is good for two trips through the tunnel within 7-days.
