If by "fall" you mean Sept/Oct then I would suggest the southern Utah national parks - Moab, Canyonlands, Bryce, Zion, Capitol Reef. They're not too high in elevation except for Bryce but those months should be perfect in all. But....since they're such gorgeous areas you will see people! You just can't avoid it. But the west is different in that things are so spread out that it doesn't "feel" crowded - except in mid-summer
There are many, many other very scenic areas but getting into higher elevations might give you some early snow - but that would be beautiful too! Yellowstone and Grand Teton Nat'l Parks are very pretty in Sept. and first week of Oct. Fall is our favorite time for the western national parks but we know from experience that sometimes the weather will enter into it. Have a great trip wherever you choose!
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Those states are big, real big out there. We took a 3 week trip (non RV) and barely covered N. Arizona with a short jaunt to Vegas (wasted time) and a day trip to Zion. Southern Utah was wow and needs a least a week itself.
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jamesu had good ideas on an earlier post, take in WA, OR, and northern CA and include Mt. Rainier, the Redwoods, OR coast, and other places along the way. If possible you should include MT on your trip west and include Glacier NP. You will naturally need to wind up visiting Grand Canyon on your return east. As many others have noted, the West is so big that you could spend several months visiting places, so maybe as one poster suggested just concentrate on one area and see everything there and whet your appetite for future trips. My favorite place would be Montana, it's big and has lots of history too.
jamesuAnother idea: stab the needle of a compass into the 4 Corners area and draw a circle with a radius of 150 miles - spend a month exploring inside that circle within Utah, Colorado, New Mexico, and Arizona.
THAT is the one I pick...excellent suggestion.....IMHO, of course
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One very important item that has not been mentioned is mountain driving. In the west we're talking long steep grades and high altitudes. Not only does your equipment need to be in top shape you need to know how to drive in the mountains. Use the right lane as appropiate, brake check areas and be very sure that you know how to downshift and minimize brake usage on grades.
Three friends took Teton Pass in Jackson. They all stopped in Wilson where the friendly sign said free coffee and popcorn while we repair your brakes. The average cost was $3000. In Jackson they then went and watched videos etc on how to drive in the mountains. So be prepared.
Coming down Pikes Peak the brake lights on the car in front of us were constantly on. At the brake check area (yes they check the brake temps) they were told to stop and wait several hours for the brakes to cool.
Like Twain said, the states are BIG. And Yellowstone NP is bigger than the state of Rhode Island. And mountains; not like driving across the Midwest or something. And you need time to SEE things to fully appreciate them. It has oft been said by me and many others on here - either cut back the miles or find more time. You do not want, for example, to give the Grand Canyon a "Chevy Chase" (from the movie National Lampoon's Vacation).
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The answer depends a lot on what you like to do -- hiking, biking, sightseeing? How long do you usually spend in one place? How big is your rig? Etc.
Most of California is kind of busy, but we sure like the Sierras south of Yosemite in Sequoia and Kings Canyon -- the groves of huge trees (the largest living things on Earth) are usually very quiet and peaceful:
Many parts of the coastal redwoods are also great, especially in the area between Arcata and Crescent City.