If you want to lower the rear, you could look into drop shackles or you could have a custom set of leaf springs made from a company like Alcan, who can build a leaf pack to your specs. Realize that changing the angle of attack from front to back has some implications as to where the aerodynamic streamlining template would fall with regards to your bed. If you haven’t already, get a good side view photo of your truck, and so a template overlay.
A “typical” boat tail on a car sticks out the back, well aft of the rear axle. Any side wind loading on a boat tailed car creates a lever arm type effect attempting to rotate the car around the rear axle.
In contrast, an aeroshell on a truck bed will be mainly centered above the rear axle, so there wouldn’t be a significant lever arm, so you could think of the wind as just a normal side load. Also don’t forget that your truck is heavier than a typical car.
So will there be any impact? Yes.
Will the impact be significant? Only way to know for sure is to build it.
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