agesilaus wrote:
For one thing if you don't already have reservations for Yosemite and Yellowstone then you aren't getting them.
I would disagree with this statement. For one, there are plenty of 'no reservations' campgrounds in Yellowstone and if they get in those early morning they'll get a site. Same goes for Grand Teton Nat'l Park which they definitely shouldn't miss. There are 600 non-reservable sites in Colter Bay and Gros Ventre. We've been to both parks many times without reservations. For Yosemite, there's a reservation window time. There are many people who don't make reservations a year in advance and some, like us, rarely make reservations. Very doable.
Also, there is wonderful camping in Louisiana, including New Orleans.
For the OP, I, too, think this is not enough time to do all you listed. Perhaps just going as far as Arizona and perhaps Utah's wonderful national parks the first year and another year taking in California and Wyoming. Even getting into Oregon/Washington/Idaho/Montana takes a LOT of time. We've full-timed for 16 years and travel constantly and still have not seen it all! Have fun with your planning!