pivot location
If the unit is rear-hinged and forward-latched it could rise and overrun the backlight header as the trunklid is raised.Plan-taper wouldn't interfere at all with clearance.A single soft-faced roller could engage the outer surface of the car.For no more than what it is, it shouldn't weigh very much.You'd need to be mindful of wind and gusty conditions when it's up,but that can be engineered for.
A mod like this gave Hucho about a 32% drag reduction on the 1974 Scirocco.
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