I fully understand your situation and is reason why I only book and camp at Fed, State parks, etc before and after the 3 month vacation season. Just completed over two weeks of great camping at Bodega Bay and Brannan Island SPs in May.
Everywhere is to crowded and jammed up with folks during those 3 months and I am not interested in constantly checking email for reservations. Shish.
As another forum member likes to say it is just a snafu unless it happens to him of course.
During those 3 months I camp at more remote or undeveloped campgrounds waiting for wonderful September. Life is good. Rollin, Rollin, Rollin.