I'm not planning on hauling much in the bed - it's just for getting the boat to the lake on the weekends (so much for economy) and for winter commuting here in town. I don't think I'll be doing a lot of interstate type driving so I'd only expected modest gains from aero enhancements, and want to keep cost of the mods low for a quicker return. Because it's slower in-town driving, I want to keep an eye on weight of the truck and any mods as that may be more of a factor, owing to more acceleration cycles.
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Someone on here did a small cab extension that was about 1/4 the bed length a while back and showed no results. The thinking was that a short extension may compromise the low pressure bubble that helps aid air flow over the bed.
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Do you know if they tapered the extension?