Picture those wheels on a tire changing machine. What's wrong.
Dekotora is like a Pachinko parlor (think casino) turned inside out.
This topic isn't exactly setting the woods on fire; but before I move on, here's an idea that came to me at 2 am this morning. Collapsible boat tail. The cutouts where it attaches are to inflate it but I think 2 fiberglass rods from the gutter to the tip would hold the shape when it's not moving.
The trick with inflatables is there needs to be a small vent to bleed air off so more air can ram in. See Frei Otto for sizing.