This link should take you to a Google Map I've created from the campsite data numbered 1-51 and which relates to the posts below. What it reveals to me at least is that to do the job properly I'm going to have to fly to LA, and 'do' all the Pacific coast and the northern states. I'd better get planning ... and saving!

https://drive.google.com/open?id=1Lf57UIgTfVcKTbp7w-fYP7c9zz1EeO-X&usp=sharing

If it doesn't work please PM me.