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If it was going backwards, the air would slam into the door like a brick wall, and fan out. Just because the optimal shape for a given length is a teardrop doesn't mean everything that tapers from front to rear is good. A forward wedge is better than a backward wedge any day of the week.
It's shaped the way it is to fit cars which have a low front. The back has to be big enough to fit whatever fits in the rest of the trailer, because that's where the entrance is.
If it was tapered to the rear, why not just build the whole thing at that height?
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