"you'll lose significant power and tow capacity as you ascend our higher passes".
With one exception: a super or turbosupercharged engine can compensate to maintain the same chamber pressure at altitude. The problem then becomes that instead of 87 PON regular, I have seen 85 and less at altitude so you also need direct injection, either diesel or gas.
If towing a lot in the Rockies I'd probably have a Ford EcoBoost or a TD (and expect a new EB is less espensive to buy than a TD)
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Looking for a 24/17 in or near Florida.
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