Am I having hot flashes? Or is it getting a little hot around here??
Lawsy - - -

If the OP wants to ride on I-40 from Barstow to Memphis,
Then take US 78 to the coast - that's his business.

But it appears that he hasn't ridden cross-country before.
And that he wants to do a cross-country ride - albeit in 30 days in August.

He also asked for opinions on his route.
And I will stick by my call that there are way better options -
Even with the 30-day limit.

No, he doesn't need to stay at home on his trainer -
But why not opt for the best possible route and conditions?
That would make the experience far more memorable.