[euromodder]

close the gap between truck and trailer as much as possible (preventing cross-flow)
it's where the V-nose will help, and a vertical baffle plate along the centreline, too - allowing for vertical articulation


Consider rounding off corners, if possible

but NO semi-circular rounding off on the rear (in plan view)
It'll make the trailer sway : Coanda-effect working sideways, aft of axle/pivot -> sway