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Even the biggest deflector isn't going make any measurable gains when loaded, and will hurt when empty. For you to see any gains it would have to start at the front bumper and swoop smoothly up to building roof height (and width).
All I can think of is to make a deflector for the back of the empty truck bed to deflect air over the trailer. Even then I'd guess the gains to be small unless the fairing is also the width of the building.
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