Stayed one night in a converted Sprinter while traveling through South Dakota, we needed a place with showers. 

The showers and restrooms were pay to use, with a single curtain as privacy. (Men's and women's separate rooms of course) They were clean for a public shower, definitely wear shower shoes! The only complaint was the women's showers did not have working lights. 

The site itself was clean and decently level.

We rolled in after sunset and left before sunrise, so we did not have any views. FYI if walking around in the dark be careful where you step as there's hidden mud holes that will ruin your shoes.