That reminds me that on one of my trips west (it had to be the late Sept 2017 road trip), I'd stopped to gas up in Dillon CO and saw a couple of manufacturer plates at the next pump. (They were both white--may have been F250s, possibly F150s, didn't notice the exact model.) I figured they were doing some high-altitude runs in that area.
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Yep, we spent quite a bit of time in the Dillon/Frisco/Breckenridge areas. Engine, transmission & OBD2 Calibrations all had specific sign-off requirements at altitude.