Hi Adam, there is a great website called couchsurfing.com that you can use to stay for free at the home of fellow travellers in their countries. I would advise against camping in U.S. campgrounds often because they are expensive. Advrider.com is a motorcycle website similar to this one and they have a 700 free campgrounds that you can stay at in the U.S.
As far as which states are best for backpackers that is a hard question. I would say that you would really enjoy Colorado, Minnesota, Wisconsin, Vermont, and Utah if you are into the outdoors. I would avoid to much time in California because it is expensive.
Hope you have a great trip,
I am near finishing the same trip,
Geoff
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