Another bit of advice - if you go UP in 3rd gear (for example), go DOWN in the same gear. Let the transmission/exhaust brake do the work. We live in Pagosa Springs, CO, and travel over Wolf Creek Pass (US160) frequently, which is much steeper than I-70, without problems. Enjoy the trip!
And, welcome to iRV2!
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Joe and Debbie, Emma the Aussie Cattle Dog who adopted us
2012 Discovery 36J, Blue Ox and Air Force One, 2010 GMC Acadia Toad
USAF (Ret) WDØM
https://wd0m.com