Ive stayed at this place twice during the ralley. It was very functional, nice showers, bathrooms, easy to find, semi close to everything. during the ralley they served a $5 breakfast that was awesome. some of the tent sites have a plugin and a small tin roof over the picnic table. No trees, a quarter mile of gravel road, close to interstate some noise, I would stay there again but I aint goin there to camp I'd go to ride!
http://realadventures.com/rates/1025217_Three-Flags-RV-Park