For aerodynamics to be a driving force in which trailer a purchasing department should buy, someone with a lot of capital is going to have to "reinvent the wheel".
And for the acceptance of intrusive body panels and boat-tails you will need to also reinvent the industry.
From my own thoughts, moving the loading floor lower in the trailer is important. The problem this poses is that tires have to be large enough to carry the load and if trailers were lower you would half to address the fact that there is a standard dock height. Perhaps using the air brakes to raise the rear of the trailer?
__________________
|