Something else to think on. The boat tail could be used mainly for long highway trips where it would be most useful. You could even block the rear window since on the open road side rear views work pretty well. Then, when you're back in town, stow it. This way you could make it out of much less durable materials since it only gets used once in a while. Think "Air Mattress" tech instead of "Rubber Raft"
But I suppose if you drive on the highway a bunch everyday for your routine commute, this is a crappy idea.
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