Originally Posted by TheHeartBreaker
Will add to that
Trailer Tow Group IV – Heavy-duty engine cooling, engine
oil cooler, 220-amp alternator, rear load-leveling suspension
(not available with Quadra-Lift air suspension system), fullsize spare tire, steel spare wheel, Class IV receiver hitch
with seven- and four-pin wiring harness
The question was, what comprises heavy duty cooling. I'm not sure a trailer hitch is part of that.