This is a very common request for information, so you can find out LOTS by doing a search. Almost all roads are "main roads", so no issues with gas, etc. Towns are a bit apart, though, so don't push until almost empty.
RESERVE campsites NOW for your destinations. Very popular areas. We did a drive through of both this past summer, on the way to the west coast, and while we found overnight places a day ahead, they would not be preferred if we really intended to stay a bit.
Not like the old days where you could just show up around 10-11 am and be pretty assured of getting a campsite.
2012 F150 Eco, 4x4, SCrew, Max Tow, HD Payload
2017 Grand Design Imagine 2670MK