in perth, these is Capral, who do aluminium, maybe same mob Aust wide.Jayco only ever installed 0.9mm propeller plate. I could only find 0.9mm checker in mill finish. I powder coated it black.
I reckon itS more cosmetic. And thin to keep down weight. A 2.4m *Try posting a bit more so your post isn't boring*.2m sheet was $55.
PS: propeller plate is the style in the banner above
they do the propeler plate.