Question on roadtrip route...

This march i will head out for a 2.5 month roadtrip, and need to be back in NJ by mid may. I will be mostly camping and exploring.

On the google maps route attached i planned on doing the middle route, with the options to add any/all of the other three routes which are a cali route, a PNW route, and a South dakota route (sorry for not color coding the optional routes, google was being fussy).

My question is for those of you who have done something similar, whether my middle route is doable and if i can add any of the other routes as well, or is that too much considering my time frame? On one hand, this will be my last big trip for a while because of work so i want to see as much of the US as possible, but on the other hand I don't want to rush through a park like Yellowstone and leave having only saw old faithful... Any advice, tips, anecdotes etc. would be greatly appreciated :]

https://drive.google.com/open?id=1aXvJfbMblI20rpky1wSNqE-qmDg&usp=sharing