[elhigh]

I'm just throwing this out there, but I'm of the opinion that northern drivers, what with actually seeing the stuff more than once per winter and getting some mileage in, know how to handle snow. At least, they are nowhere near as flat-out insane as Tennesseans.

And also in the Dakotas, there's probably more than one snow plow per road district, and more than one guy who knows how to use them.

Aero. Trucks are aero disasters so anything you can do is going to be good - your aerocap is going to yield gigantic dividends.

An air dam, as deep as you feel you can get away with, will be good for you too. Also consider adding side skirts. The underside of your truck has as much topography as the Grand Canyon, so if you can keep the wind out of there that's to your advantage.

Lockout hubs for your front end will eliminate the parasitic drag of your front wheels spinning your front driveline when you're in 4x2 mode.

Slow down! That's assuming you haven't already. Aerodynamic drag goes up with the cube of the velocity, so going twice as fast takes eight times as much power. Slowing down even a little can yield big savings, especially with a vehicle as aerodynamically noisy as a pickup.