I was looking at axle trusses for my Jeep to give the axle a little bit of taper, but thats quite a bit of weight. The bonus to trusses for me is it also strenthens the axle.
On my Frontier I was figuring on just a lip on the front pannel to divert most of the air arround the axle, and another panel behind it that is rounded and cover all but a round hole for the spare tire, boxing in that section back to the bumper.
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