The Standard
All KOA's should be as nice as Grand Junction, unfortunately we all know that's not the case. Wide fenced lots, with fire pits and picnic tables. Very clean park that shows pride of ownership, they obviously give a crap about their parks image.
The best campground in Custer State Park
This is the ONLY campground in Custer State Park that has GREAT connectivity with ALL wireless carriers. It's a small campground all paved and spaces are big enough for just about any size rig. The 2 sites in the back, back up to trails that take you into the back country. Beware, that wildlife can and will enter the campground. Deer and Buffalo are very common.