Originally Posted by deryk
Even though the tongue end is rounded around the flat door your going to get a little drag from that. The door would do better at the rear.
The Bowlus shape is pretty near perfect if you want low aerodynamic drag - rounded front edges (sides and top) with a long, long taper to a point. The only improvement would be to make the trailer cross section more closely match the tow vehicle cross section. Even back when the Bowlus was made, autos weren't nine feet tall and six feet wide.
Sharp fronts to "cut through the air" are pure styling and have no aerodynamic value (assuming you aren't going to tow near the speed of sound....).
Sadly it looks like the new Bowlus has abandoned the original's stunning space-frame internal chassis, mostly made from circular tubing around 1" diameter. But then that chassis did restrict the interior to those longitudinal settee/beds each side since the bed fronts were covering chassis members.