Trailer campsite, essentially. Shared toilet, shower, laundry, and kitchen facilities. We had a private trailer with little more than a bed. The highway is nearby but even on the close-side to it within the park we barely heard any road noise. Really nice place for a remote retreat sort of stay - probably good for stargazing on a clear night.
Note: showers work well but automatically turn off after ~7 minutes. You get a 60-second and a 30-second warning (brief pause in water) before it turns off. It then won't turn back on for a little while.