There are two major sets of grades between Cheyenne and Salt Lake City. If you're on I-80 you can't avoid either of them (even if you go I-25 to Ft. Collins to Laramie). The first is between Laramie and Rawlins, WY. The locals call it Elk Mountain. It's a 90 mile stretch. The second is between Lyman, WY and Evanston. This one is called The Sisters, and it's about 30 miles. We travel both all the time - we've lived here 35 years, and you just can't avoid them. In the summer there's no problem at all. You'll sometimes encounter 35+ MPH winds (very common) at any time. There are 3 lanes along the steepest sections of both. You'll be fine.
Between Park City and SLC you'll go down Parley's Canyon. When my brother was driving his motor home down it and we were talking by walkie talkies back in the day, he asked if it would ever end!
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2017 Jayco Melbourne 24k-Jeep Wrangler
2013 Bullet Premier 19FBPR-Dodge Durango V8 Hemi
2013 Rpod 177HRE-Jeep Liberty
2011 Aliner Sport-Jeep Cherokee
2008 Little Guy 5^Wide-Toyota Avalon
1980 Shasta 21-GMC Suburban
1981 Coleman Tent Camper-1981 Dodge Ramcharger
1978 VW Westfalia
Lots of tents
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