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rear
The boundary layer in the aft-body of the Ranger has got to be handled with kidd gloves if separation is to be prevented.
For your diffuser and cap extension to function,you'd need a really well executed belly pan upstream.
Cleaning up the sides of the truck would also help provide clean rectilinear flow to the beginning of your new 'sink'.
Front wheel gap-fillers,wheelhouse rear edge radii,rocker panel extensions,flush wheel covers,and rear wheel skirts would all help provide the cleanest flow at the rear.
Then,your cap and diffuser extensions would have their best performance.
Also,you could add in vertical sail panels behind and to each side of the tailgate,which would help tailor the new wake.You'd trap a vortex in the outer sides,with re-attachment at the ends and end up with a smaller wake of higher base pressure,netting you additional pressure drag reduction.
And the added weight would be offset by the tailgates removal as you've already mentioned.
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