naturist wrote:
Do be alert to the fact that the EASTERN entrance/exit for Zion has a tunnel that only smaller trailers can negotiate. 5ers and Class A/B/C rigs generally cannot pass that way, due to low clearance. Thus if you are doing Zion and Bryce, plan to take the long way 'round via the western entrance/exit.
This is a rather misleading post.
MHs over 40' and combined rigs over 50' are prohibited. Otherwise you get a permit and drive down the center while oncoming traffic is held up. Google Zion tunnel for all of the information.