What I meant was that as National Parks go, 72 miles apart per Google Maps is relatively close, so we’ve always visited them both on same trips from Texas or Florida. I recall at least 4 trips over the years — not all in motorhomes. Once we stayed at Lodge inside Zion when traveling by SUV with older family members.
I’ve avoided summer trips due to traffic congestion, and can see where getting through tunnel could take some time. For that reason, we’ve stayed at one park for a few days and then moved to the other. Commuting daily from a middle point isn’t something I’d look forward to.
For what it’s worth, if time permits and traveling from East, I’d recommend considering a stop at the North Rim of Grand Canyon. It’s also “relatively close” by my driving standards. We’ve stayed at the Lodge and at campground of North Rim. There is something special there for me that’s hard to describe.
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