[NewMPGfrontier]

I've been thinking about making an Aero cap for my Nissan Frontier 4X4. I haven't been able to find a lower kit for the rear-end of the 4x4 version all of the kits specify that they are for the 4x2 version only. If I can not lower the rear I might as well cap it. The majority of my driving is north south driving and living in the midwest with lots of farm fields I have a lot of cross winds
Does an aero cap help hurt with cross wind drag?
I have read a lot of discussion about boat tails and cross winds. It seams that the same might apply to aero caps except that most aero caps have a slightly different shape.
Could I be better off with a tonneau cover giver the issue with crosswinds?
A tonneau would be easier to make than trying to get the curves and angles correct for an areo cap.
The materials I have on hand are sheet metal and cattle panel I could buy plywood but the most savings comes from using what I already have. I could easily make a 2/3 cover too as the diagrams I have seen show that has some improvements as well.