Been there, done that twice. You'll love it.
You should check out the usual stops. Petrified Forest NP, Grand Canyon NP (both South and North, very different places), Bryce and Zion, Arches, Grand Teton, Yellowstone, Glacier, Death Valley. Heck, take the entire spring, summer, and fall, and you might scratch the surface.
We follow the 2,2,2 rule if possible. Drive 200 miles a day, arrive before 2 PM, and stay 2 days. If you insist on driving 300 miles, arrive when you get there, and move on the next day, you can get from West Virginia to Seattle in 2 weeks. Ditto Los Angeles to Virginia. But the real joy is taking your time and being able to see and explore the fabulous sights along the way. This is a great continent we share.
There is a book my daughter bought for us when we got our RV back in 2008: "Road Trip USA" by Jamie Jensen. It's about 900 pages detailing 11 different cross-country trips via 2-lane roads, mostly, with tips of where to stop and what to see on the way. So far we've managed hurried trips on 2 of them, can't wait for the DW to retire so we can take more.
Clicky
