The rear section , chrome vinyl applied , BMF on the lower I have no idea what to call it diamond plate
And the rear sliding doors, now, I sort screwed myself on them, when I made the rear section that doors are on, I made the gap for the doors really tight, so I was not able to make the doors look they do on the real trailers, I was going to add strip plastic on the outer edge to make a frame, and I was going to add a window, but there would made them way to thick and would not allow them to slide for the open position
And the generator compartment