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Perhaps a not very good idea.
I like the idea of the areo caps. I also see that a 12 degree downslope towards the rear is beneficial. On all of the ones I have seen drawings for and some of the very nice ones people have built, using the 12 degrees (roughly) from the cab height means that there are varying degrees of height required above the tailgate to maintain the 12 degrees. What if I was to take the 12 degrees and start at the tailgate to then come forward. I mocked this up and on my ranger I would be about half-way up the rear window. The benefit to this approach is that the rearview mirror is still useable. The question is, is there the same benefit in areo? Instead of one larger trailing edge, I would have two, which in total height would be the same as a single one, but it would break the airflow twice instead of once. (is this a bad thing).
Thanks
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