Aluminum Cobras certainly have the nasty habit of "raining" on the inside due to condensation. The more humid the climate, the worse it gets.

Is the insulation just "raw" EPS board (expanded polystyrene like Dow blue styrofoam) glued to the inside? And only the roof - - not the sidewalls?

If it is just "raw" EPS board, I would think it would dent, ding, and pick easily and look awful after usual wear and tear.