TSM, I have not been West during those months - june/July/Aug . It's peak touris season and the kids are out of school. So this means the national parks and campgrounds are generally full and bumper to bumper traffic at some. This would force me to BLM camp when available which is free but zero amenities which means water rationing. Next is the heat and again it's peak heat months.
Last is my selfishness of bailing out of peak Giant Ragweed season at home. For 30ish days these plants seriously kick my ass. It works out though because I avoid the crowds and catch dry weather to hit the trails.
As you can see by my map I need to go the NE, I hear Maine is amazing in the summer so that's on my short list this year, along with 3 weeks West in Sept.
Aug is out, we will be in Minnedosa Manitoba visiting family and attending Rockin the Fields concert:
"You do your own thing in your own time"