Sounds like the place just south of Rapid City on US 16.
Great views, good location, but the camping sites were anything but level.
Mind you, don't know for sure here. So many possibilities in that area.
The Mad Norsky, Doll, Logan and Rocky
2014 Ram 3500 w/ Cummins/Aisin
2019 Northern Lite 10-2 EX CD LE Wet Bath
RV'ing since 1991
I took the road less traveled .....Now I'm Lost!