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Well as post #2 points out, the topic has been discussed thoroughly, though not recently.
I'd like to see it done just because it's uncommon and an interesting engineering problem. It still doesn't present a practical solution to a problem. A pusher trailer probably isn't going to get better fuel economy than a Prius on the freeway. Even if it does, it wouldn't be useful when it's cold out because a Prius would use the waste heat to warm the cabin, but the waste heat from a pusher cannot easily be utilized. Then there is the whole hassle of it in the first place.
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