I stayed here as a base camp for Zion. It's 30ish minutes from the south entrance, and the road you are on leads to the Kolob Resiouvior via a really cool drive. There seem to be a few sites that are easy pull in/ pull out. Some have rough roads to get to the sites. BYO shade and bathroom. Hotter than Hades in July, but once the sun drops below the cliffs, it's an amazing place to chill while you plan what to do the next day. Full cell service (T Mobile) 5ish miles to civilization in La Verkin or Hurricane, a little further to Springdale. At least in July, not a place to hang out during the day unless you have rocking AC in your rig (I don't). Bats fly around at dusk, it's cool.
Lots of sites, easy access. Avoid the super sandy spots, especially if you get there in the dark. There are plenty of others. Camped in a RTT on a trailer which wasn't crazy about the washboard grading, but that's mostly a "me" problem. Just after the 4th of July and I had the entire place to myself though due to a ton of consolidated firework trash I bet that place went OFF on the holiday.