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thanks for the replys. post #85 in the referenced link is the closest drawing to what I had in mind with some slight variations to accomidate larger items that I haul around.
at what point does additional weight to framing the cap offset the fuel savings. my drive to work is 80/20 highway/city. recreational drives hauling items (mountian bikes and road bikes) are almost all highway.
structure materials- coroplast for the skin. skeleton - ?? wood= higher weight, pvc= flimsy, other plumbing piping= unknown strength vs weight ratio.
what materials have been tested on here that produced positive outcomes. I want to consider safety of other drivers vs maximizing fuel efficiency/testing.
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