Just got back from the State Park at Grenada lake. Rode out there to eat my lunch. Stopped at campground and asked about tent camping. I was informed that tent camping was fine with no extra. Simply pay the daily rate for a site and put up a tent instead of a camper. They were not sure if all of the state park campgrounds had the same rules, so I guess I will just call Sardis and ask the campground attendant..... More info will follow.