Terry,
Sounds like a great trip. I would consider running the trip in reverse to try to avoid the worst heat, but it will work either way.
One thing to check (its the only state we have found where it is an issue) is the legal routes in California for a 45 foot motorhome / bus. Here is the website: http://www.dot.ca.gov/trafficops/bus/bus-map.html You have to pay attention to what roads you want to take and whether they are legal for your bus. If you don't have one, I would also order a Mountain Directory (West Edition) for your trip. It will help you plan your route. Here is the website: https://www.mountaindirectory.com/ Most of the roads will be fine, but you will want to pay attention on your route from Yellowstone to Devils Tower.
In Las Vegas, you have Hoover Dam and Red Rock Canyon which are easy day trips and worth the effort. In California, we have been to Joshua Tree, Kings Canyon, Sequoia, and Yosemite National Parks. Our favorites are Sequoia and Yosemite. We have Redwood NP on our bucket list and hope to get there one of these days. In Oregon, if you have time I would try to see Crater Lake National Park. The town of Astoria (at the mouth of the Columbia River where Lewis and Clark ended their Corps of Discovery expedition) is a great stop. Outside of Portland is Multnomah Falls and Vista House (overlook for the Columbia River Gorge) which are worth seeing. In Washington, we have been to Mt Saint Helens (National Volcanic Monument) and Mt Rainer National Park. Both are worth a visit but make sure the weather is going to be clear or you may waste a day to be in thick fog. In Seattle don't miss a stop at the Pike Place Fish Market. If you are heading through Montana, I would try to spend a day or two at Glacier National Park (our favorite National Park). There are numerous campgrounds in West Glacier area. When you leave Glacier take State Highway 83 south of Kalispel to Highway 200 east to Highway 141 south to Avon and then Highway 12 west back to Interstate 90 - the 200 - 141- 12 drive is one of the best (most scenic) drives we have ever taken in the bus. In Wyoming, I would plan a part of the trip to drop down from Yellowstone and see the Grand Titans. In South Dakota don't miss Custer State Park (close the Rapid City) and the drive down the Needles Highway (in your toad).
Finally, when you leave Petoskey, stop in Dearborn at the Henry Ford Museum and Greenfield Village. The Henry Ford makes the Smithsonian look like a second tier operation.
Sorry for the Tourist Department brain dump.
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