Sorry to disagree with your comment, but reduced hp reduces towing capability. When determining if a vehicle can handle the load, altitude does need to be taken into consideration. Turbo may help some at altitude but there is still a significant reduction in performance. I live at altitude and have driven my turbo vehicle to sea level. There is a huge difference. I own a 2015 1/2 with a small engine and it pulls my trailer (7740 gvw) just fine. HP is just a small part of the equation and diesel is not a necessity for altitude either; could be overkill. This particular situation does suggest the tow vehicle is not capable and different one is needed, but a small engine 1/2 ton with a tow package should work out just fine.
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