Quote:
Originally Posted by MetroMPG
From a *modding* perspective, the stepside may give you better gains, as you can build in some proper aero-friendly taper aft of the rear fender that you wouldn't be able to do as easily on a fleetside box.
However, you'll also need to "bridge the divide" forward of that rear fender from the trailing edge of the cab, backward.
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One would have to deal with the gas cap access and taillight issues.
Seems more comprehensive to start with a flatbed and aero the whole thing from scratch.