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Uhaul puts large radius corners on their box all the way around but they don't have a deflector. I believe part of that is because they have 3-4 different chassis that they fit the same box to.
Then there is the cost / benefit analysis. A deflector would increase cost to save fuel. Uhaul doesn't pay for fuel so why add cost? Most of what they have done is optimizing parts they have to have to be better not adding additional parts.
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