What the Heck Is It?! (semi trailer design)

Factual Questions
21

The triangles allow the fluid to funnel to the pipe at the bottom, which allows better capability to drain the tanks fully.

22

Thanks, fingers and phone were conspiring to not cooperate (heh!) with me at the time.

23

I thing the “front part” is just sheet metal air dams along the side to provide streamlining for better fuel mileage. These ones appear to be an integral part of the trailer rather than being bolted on as an addition.

24

Thanks!