I have seen one of these in person.  A Canadian was passing thru at the
local VW dealer for service last summer and I saw it up top, and they bought
the van with it already attached.

Did not look too large, aerodynamic in the front sort of like a
semi-fiberglass to smooth air flow..........and appeared watertight.  You
could not get a big suitcase in it,m but a large duffel bag and some other
stuff would fit.................

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