Trying to get a campsite

sounds like you're trying for campsites in high season.
that's why we refuse to camp in California in the summer.

we have no problems getting Yosemite sites for April-May, but you still need to start reserving when they are first available.

like it was said, too many people wanting to camp in California, for the amount of campsites available, especially coastal campgrounds and Nat. Park sites.
remember, you're competing with not only Californians, but out-of-staters and visitors from other countries.

that's why we camp in the spring, fall and winter. since you can camp year-round in California, why do it when everyone else is.
the weather is still great, especially in spring and fall. Tahoe is great, in the fall after the kids go back to school.

of course, if you have kids, then you're stuck.

Just too many people in California. :) Seriously though, friends of ours told us that in order to have even a ghost of a chance of getting a campsite in Yosemite Valley, you have to go on the site at 12:01 AM, not 7 AM. I think a friend of theirs got sites for them when he got his own, and that apparently was his technique.

I was lucky enough to reserve a site in late May, 2010.:) But not lucky enough to use it. :M The site was long enough, but after trying for over an half hour to back the MH in to the space, I had to give it up. :( Narrow road and too many trees.
Luckily, I was able to get into my Thousand Trails park on 120 just outside the Parks entrance. I don't even try anymore.