rv2go wrote:
You are too long to go thru the tunnel, so Springdale will have to be the entrance. If you can manage on only electric, I would try and stay in the Park in the Watchman CG.
This sums it up nicely. I would note that there are only 24 sites in Watchman that will fit your rig and those fill quickly. Watchman is in the park, close to the Virgin River and visitors center, and convenient to the shuttle which will take you into town or up the canyon (you can't drive your own vehicle into the canyon except during the winter).