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Randy: I think the thing to understand aerodynamically is that a gentle slope or MOST ideally - a tear drop shape, is the best thing for preventing turbulance and drag.
So a regular truck bed with the tailgate up isn't as bad as one might think. A tonneau cover is pretty good but a cab height camper might actually be a little bit worse and yes, the aerobed idea is the best even though it still has a sharp drop off which can create some turbulance.
Anybody stop me if I'm wrong but I think that about covers it.
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