The trapped air is what I'm concerned about. I'll end up pushing the air, creating an invisible bow wave, instead of it being compressed under that angled cross member and heading under the truck.
The truck itself has a fairly flat nose, though I have about a foot of space to play with. I could build some tire spats on the factory air dam, or possibly heat it and force it outwards, allowing the air dam to be a little wider. That would also help the new air dam from dumping all of its air on the center of the tire.
__________________
|