I guess if NASA hires you to send space craft to the ISS, and you are the first to be able to recover a spacecraft from orbit, you may have some idea of aerodynamics and how to build a car.
Wilber didn't say it wouldn't have good aerodynamics. He is looking at it and questioning its functionality.
Also, if you're towing a trailer that has a flat front, of course it will severely affect the aerodynamic efficiency.

