We stayed in the West Campground in our 24' rear slide out. We had plenty of room. We even have a small toy hauler in the front and with that door let down we still had ample room. They completely redid the shower and bath houses about a year ago and they are very nice. Showers are low flow but I expect that in state and national parks. And just a note even though we had water and electric hookups I do like to test the shower facilities for reviews like this. We checked in after office hours but had no issues since we did all our registration online. Park staff were very friendly and helpful especially regarding mountain biking trails.
IMPORTANT NOTE ABOUT DIRECTIONS: If coming from the West, Google Maps shows an entrance that does not exist! Be sure to continue on to the main/proper park entrance that has the actual state park signage. I have submitted to Google a recommendation to delete the old road because if you take that turn, it's not easy to get out.