I don't like taller grills either. They are terrible off road - preventing you from seeing much of anything - but they can also be a hazard in day-to-day driving, like in a parking lot.
They are, however, driven mostly by function - not form (or style). The taller grill increases cooling quite significantly, and as the power and towing wars continue between the big three truck manufacturers (Ford, Ram, Chevy), heavy duty trucks are producing more and more horsepower and torque, with higher and higher towing and payload capacities. These trucks need greater and greater cooling capacity. We can have a whole other conversation about whether that increased power is truly necessary...
But if you look at the capacities of these new trucks, you can see why the increased cooling is necessary:
- The Ford F350 diesel is now making around 1,100 lb/ft of torque (over 2x the diesel IG, and 3x the gas IG - just for comparison)
- Max towing for the diesel dually, using a gooseneck hitch, is 37,000 pounds (5x more than the IG)
- Max payload for the gas dually is almost 8,000 pounds (4x more than the IG)
Of course, most people aren't speccing their trucks to get these numbers, but still, these numbers are insane.
NOTE: I am only comparing it to the IG for perspective, and to give an indication of how much more cooling would be required - I am
not suggesting that the IG and the Ford F350 are in the same class of vehicle. That would be dumb.