[Frank Lee]

The giant leading radius thing threw me off. My understanding of streamlining a brick (from Hucho) is that any radius above a certain minimum (that which allows "attached" flow down the sides) does no further aero good. I understand what you are saying about filling in over the tongue... just be careful with that, not only do trailers swing from side-to-side for turning, they pitch up and down over anything other than perfectly flat terrain. Figure out the maximum pitch difference tween truck and trailer ex. rear truck wheels in curbside gutter w/trailer going up a drive so that no contact occurs. For sure compromising a tad on aero is better than fixing damaged bodywork.

I'm aware of the trunciated tail panels... and this doesn't appear to be that. I still fail to see how it reduces drag in its current form; perhaps the side panels have good flow (are they angled in?) but the top and bottom are not interacting with the flow at all thus they'd do nothing. It's not about thwarting a vortex, it's about reducing the trailing wake area, and from the pic I don't see any of that.

If it truly does work then great, more power to him. We should send the case study to Hucho tho...