Willie,
I have a 2016 Silverado HD gas 6.0 with 4:10 gears and six speed transmission and have hauled my Outback 298RE last summer to Colorado Springs and it does fine. All hills and different climates will cause a slight adjustment on the vehicle until the computer adjusts. I think you’d be fine looking at a used 2016 Silverado HD gas.
Good luck on your decision and happy RVing
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