How to go with the flow but restricted by reservations?

Forty years of camping and never a reservation! Never a hookup, not even electricity. Mostly in Canada and we stay well away from cities most of the time. Much less crowded in the north. And cool enough to take air conditioning off the necessary list. Most of those years were in a tent trailer with no toilet so we often made a point of not travelling on a weekend. No worries with the motor home.

Why not practise dry camping in your driveway?