You don't say WHEN this summer, and that is the kicker. Many, many campgrounds institute a minimum 2 night stay on major holiday weekends, such as Memorial Day, Independence Day, Labor Day. It is because demand is so high, they sell out early, and rather than take a loss on a site they could have filled both nights, they make it mandatory. I have never run into a minimum 2 night stay except on one of those major holiday weekends.
So I'm guessing you are talking about one of those holidays, and all I can say is "good luck" finding one. Might just be the night you spend in a Wally World parking lot.
Given how popular camping is on those weekends, you are very likely to find that finding a place to stay at all on the second night of that weekend will be very difficult. If you really want to camp, this might be God's way of telling you to sit still for that second night.
I know, not what you wanted to hear. I wish I could point you to the campground of your dreams for a single night that weekend. Best of luck finding what you want, and remember to stay safe out there.
