Gary,
Here's a link to Horsethief CG in Utah:
http://www.blm.gov/ut/st/en/fo/moab/recreation/campgrounds/highway_313/horsethief.htmlMy DW thinks we may have stayed in it last October during our Utah tour. We were right in that area during the trip, but I can't recall if we specifically stayed in that CG or not. We stayed in a mix of designated campgrounds and just plain out in the middle of nowhere campgrounds boondocking in the desert. Some great looking places we had to pass up because I didn't want to try them in our Class C that doesn't have four wheel drive.
BTW, this park is a little jewel also - just across the line leaving Utah going into Nevada off Highway 50. It's Lower Lehman Creek CG within the Great Basin NP:
http://www.nationalparked.com/US/Great_Basin/images/pages/Lower_Lehman_Creek_Campground_Photo.php