About the steepest grade I've seen was the approach to the Thomas B. Manuel bridge in the turnpike.
Did cross the spine of Florida at Clermont (few miles of dramatic elevation changes) and the heep didn't even notice it bringing the TM home, just left in cruise.
6400 rpm redline and 4000 rpm torque peak means 55-65 in 2nd (of 5) is no problem with an overall gear ration of about 7:1. High winding modern engines can do a lot more with less if they have the right gears.
Personally for 2015 3-4 liters is the sweet engine size for a tow vehicle. With direct injection and boost, 2.5-3.5 liters. Key is to be able to stay out of PE.
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Looking for a 24/17 in or near Florida.
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