Learn to boondock, or, camp sans hookups. Most all new campers are totally reliant on hookups, so I'm thinking that's what you're running into.
I wish more campgrounds would realize that not *every* space has to be reservable. Leave some, 10 or so, open to FCFS. California state parks have no clue of this concept. Utah does pretty well at this.
"If I'm wearing long pants, I'm too far north" - 2oldman