The Cabela's in Sidney, NE. has a real RV CG on site. Elec, Water, Dump station, cable, and private lockable shower rooms for $30/night. Don't know if they do it all the time, but when I was there, they cleaned the shower rooms(sinks and floors) after each use. Don't know if they have beer for your horses, but they do have a corral.
🙂
Retired and visiting as much of this beautiful country as I can.