here a real quiz for all of you engineering minds.
ever notices how almost all of euro's TT have no gap at all between the truck and the trailer, and here in North America most of all TT have around 3 foot gap ?
how they do that ?
If you want aerodynamic, shape your truck after a water dwelling animal. Rounded and sleek. If you don't round the rear end then you're not going to do much good as that's where most of the drag is caused. Making the front of the vehicle more pointed and arrow shaped will do wonders and leave sharp hard abrupt angle changes in the garbage. They create turbulence and drag.