[Sunwapta]

I'm thinking of larger vehicles like pickups and SUVs here... (for improved fuel economy AND reduced emissions.)

To improve the front end aerodynamics on the bigger boxier vehicles why don't they cut the rad requirements into two - place a small wide radiator up front and then put a secondary backup radiator under the body of the vehicle? (It could easily be protected / armored to prevent rocks etc. from doing any damage. Maybe even laid inside the box frames on the heavier duty vehicles. Maybe the whole rad could go under some vehicles!!!)

Alternatively, they could go to LED headlights that span across the whole the front end and then stretch the radiator from fender to fender thus substantially cutting down on the required height.