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However, more reading on this site has raised more questions.
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Questions about the aero topper, or the rest?
Lower vehicles benefit from less frontal area of the tires, and less air subject to turbulence in the underbody plenum.
More air underneath isn't a problem if it doesn't interact with the underbody, i. e., with a bellypan. The stagnation point [height] determines how much air goes underneath. An aggressive splitter puts it right at the bottom. (But a splitter at the top of the hood would induce lift) Those solar racers that run across Australia Have a lot of clearance with airfoil pants around the wheels.
As for side skirts, Aerocivic had double wall skirts to channel air around both wheels. What with break-over angles, look to P. K. Knox's Aerodynamic Template, or the VW XL-1. [links on request]
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'm going to make an aero bed topper customized to the work I'll be doing out of the truck, but I'd like to hear suggestions and input about favorable designs!
[later]
The aero bed topper plan is fully underway with a design that opens in the center when needing to haul larger cargo.
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Hinge line lateral or longitudinal?