Two years ago we stayed at Kanab, Utah at the Kanab RV Corral while we visited the North Rim of the Grand Canyon. It's a beautiful drive from there to the North Rim, about 50 miles if I remember correctly. We were very impressed with the facilities and the very clean restrooms/bath house. If you need hookups, especially in the hot summer, it's a very nice spot to stay. They have a nice web site with beautiful pictures of all the parks within 100 mile radius of their campground.
http://www.kanabrvcorral.com/