Is it possible to call campgrounds as we go?

Fastfwd75 wrote:
I was expecting to drive semi-randomly and start calling campgrounds for availability sometime in the afternoon.
Now I just saw a post about Oregon being entirely booked for august.

The popular state parks near water etc can be hard to get into. Some have first come first serve and we've been very successful with this in the summer.

If you wait until the afternoon to call have several backup plans. When we reserve we call in the morning.

I asm sure the best spots are taken by regulars that know where and when to call but will I be able to find minimal 30amp service from anywhere within 1-2 hours of driving?

Yes almost without exception.