Originally Posted by
HobbesOnTour


That's the $64,000 question!

I'm considering 2 possible, general routes
1) Trans-Canada (East to West) from Halifax. That may or may not include "dipping" into the US at times.
2) From S.C. to New Orleans, then North following the Mississippi, then West, probably in Canada
After either of those options the GDMBR south to NM, or the Pacific Coast to San Diego.
Time/Climate permitting maybe a side trip into parts of Texas, then continuing south through Mexico, Central America and down the west coast of South America.
That's why the original question was kinda vague
For me, it is just not possible to book accommodation so far in advance on that kind of trip. I don't even book it on weekend trips here (Benelux). My longest trip thus far was a 3 month trip to Spain & back and the only reservation I made was for a hostel in Paris - And I managed to mess that up by mixing up the dates!
I've no problem wild/stealth camping where I can. But even so, an official camping spot for a shower & laundry every few days would be nice 
My question was prompted by some information I have here from Canada in front of me. I was looking through the campsite facilities and noticed that a lot had no tent symbols!
Many thanks for all your input!
Food for thought
Frank
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If there are no tent symbols, then tents are not likely welcome ... often not even in an RV site.
And you can try booking a few days in advance as you go along. I did this when I toured Australia. About Tuesday-ish, I'd book a place for Friday or Saturday night because I knew weekends were busier.
The really long advanced booking times are for National Parks during peak season. National Parks will only make up a portion of your trip, chances are a relatively small portion.