Been down I-40 from Nm to NV on 5 or 6 occasions. going over the continental and/or Arizona divides without a problem. Like KC states, I find the 5 star tune made a world of difference. As for downhill, I use the Tow/Haul mode to help slow/maintain a slower speed to save on break usage. Just remember, the V-10 likes the higher RPM zones, and although it gets very loud, it loves running @ 4K RPMs.
Don't fear going over the mountains, you shouldn't have many problems except the High RPMs.
Best of luck.
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2018 Aria 3901 towing 2022 GMC Canyon CC
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