From Rushford, take Township Road 270 (E) 4.
This is a basic, no services state forest campground. No electricity, no water, no dump station. There are some nice amenities though. Each of the 8 non reservable, first come first served sites has a nearly level pad, a picnic table, and fire ring. Approximately half of the sites are suitable for a small to mid sized RV. I had no issues finding a spot for my 18x8 travel trailer. Most people I've seen tent camp or have a pop-up. Camping is $14 per night with a paybox. There is a ranger that drives through regularly. The sign says $15 per night for horse campers, though I couldn't find where the horse sites were or even if there are any. The vault toilet is what you'd expect from a hole in the ground with a shed over the top... Try not to spend too much time in there.
Great Dnr Primitive Campground. We parked our RV there. Some sites are level. Pit toilet provided. No toilet paper. Bring your own. No running water.