campsite availability from FL to NY/MI mid to end of August

We visit some pretty popular SP's and while it's true that weekends are usually locked up pretty tight, during the week we've never had a problem even in the height of summer. Sometimes you have to pivot, make adjustments or check a few places, but we've always found a way to make something work out. We've even called CG's directly and they might put us in an overflow for the night. Where there's a will there's a way.