There are tons of people that RV and boondock on Federal land. Mostly BLM land.
No hookups and people don’t need it.
we make or camping reservations in California 6 months in advance. we have teams on computers, finger on the trigger at 8:00 A.M. sharp 6 months early when the calendar opens up. Mostly we don’t get what we are looking for, it’s gone in 60 seconds.