@NavigateOverland
Looks like you are routing around all of my favorite stomping grounds. (CO, WY, UT,...)
The first modification (biggest payback for route change) I would suggest that unless you have a reason for going to Bakersfield CA and the passes are open (should be in Aug), you Skip much of the I5. Split off of your Route in Kingman AZ, and head to any of Lake Mead/Las Vegas NV/Red Rock Canyon, followed by Death Valley NP, Sierras, Mono Lake, and into Yosemite NP. Rejoining your Route at 580 West of Tracy CA.
If you have the time I'd stay north in Montana and visit Glacier NP/Waterton Lakes NP (CA) can either go north from I90 St Regis or take a more scenic route west through Kaniksu NF and by Lake Pend Oreille by splitting from your route in Spokane Wa. Then east on Hwy 2 to Havre MT picking up your route.
Boort