Originally Posted by zabeard
no air flow behind the truck... lol.
Yes there is. Ever gone down the highway and have something fly out of the bed? Air flow..
As your driving a little vaccum is somewhat created that pulls air towards the tailgate. If you have your fan pulling/pushing towards the cab, your actually fighting against it, and will not flow as well.
He's driving fast out in the desert, on the rocks i can see it not making a difference. Even in mud you want it near the cab pulling to the rear. Less mud and dirt will get sucked in.