This reminds me of our first big trip after we bought our MH back in the spring of 2006. We did only two weekend shakedowns to local parks before setting sail from Columbus, Ohio for an 8,500 mile, five week circle of the west with our two young sons (7 and 10 at the time), all the way to the west coast and back in our 35' MH pulling a Saturn toad.
We went westbound via the Dakotas (TR NP and Black Hills/Rushmore), Wyoming (Devil's Tower, Yellowstone, Teton), Montana (Little Bighorn), and to the Oregon/ Washington coast (Fort Clatsop), then all the way down the coastal states via Redwoods and Sequoia NPs. We spent a few days in SF and several days in the LA area doing various touristy things and going to the beaches, then headed east hitting Las Vegas, Hoover Dam, and the Grand Canyon on the way back home to Ohio.
We did it all in five weeks and everything went well with no problems at all other than regular gasoline prices averaging $4 per gallon back then for the entire trip (yikes). We loved pretty much every minute of it. I was so glad we got to do something like that (and a similar month-long trip the next summer to New England) while our boys were young and while we still had their mom with us. Unfortunately she was diagnosed with stage four cancer in 2011 and we lost her in 2015 in only her 40s. Our boys are now grown young men.
I have no comments on your proposed itinerary, just good luck. Go and make some great family memories while you can.
