The cargo rooftop carriers that you get from sears, you should probably mount it backwards, right at the end of your vehicle. It might hurt a little less that way, by helping to train the flow down over the rear hatch of your van.
But, probably not. You'd almost be best off trying to take everyone's crap and making a boat tail out of it on the back window of the van, honestly. Might get a gain out of it!
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