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I have been considering to fabricate some mounting hardware to mount a box to my MR2 Spyder to increase its cargo capacity when required, however I've been not quite sure how to mount it as the position affects aerodynamic drag a lot.
Plus my car has less drag than a Prius in stock condition, so any effect on that will likely be very noticeable.
Obviously the ideal from an aerodynamic perspective would be a fastback-style hardtop as is available for the Porsche Boxster (makes it look like a Cayman) and for the Honda S2000 (wich is sold by Spoon IIRC).
Not only would it increase my rather small cargo space, it would also reduce my aerodynamic drag.
But that would be a very complex project, expensive and hard to get right.
Next best would probably be mounting a small-ish box transverse behind the roof above the engine bay.
This would very likely increase my aerodynamic drag to some degree by increasing the wake behind the car, but not as much as a normal mounting position would as it wouldn't increase my cars frontal area or at least not by much.
There are cargo racks available wich mount there, wich makes this a lot easier.
The last option would be to mount it in the conventional position, wich would result in a significant drag penalty as it would increase my frontal area, wake size and possibly make the flow seperate from my rear window and engine bay.
This would also require some fabrication as my car doesn't have a structural roof or hardpoints for that.
Plus the rear mount would need to be very tall as it needs to be all the way back over the engine bay.
This has been an option for the AW-11, but not for the ZZW-30.
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