I haven’t read through this entire thread so forgive me if I’m repeating anything….
Screw the campgrounds! Especially these days when the mass exodus of adventure wannabee city folks is overwhelming. What’s the point of getting out if you’re just packed in next to someone else? Look at NFS and BLM land. In most cases you can find a wide area on a dirt road or trailhead or turnaround or dead end and just camp there. Granted, it’s dry camping, so if you aren’t prepared to “rough it” then this might not be for you. But man, the solitude is priceless. I pull my horse trailer out into the wilderness several times a year and set up camp for 3-4 days. Even my parents, with their 44 ft luxury motorhome can find isolated spots. Obviously this is much easier in the western US, but not sure where you live.