2011 3455sa. Had no cracks up until last year when the door blew shut very fast with a battery lantern sitting on the top step. The lantern was sandwiched between the door and the bottom sill, flexing the door and created a crack from the lower right corner of the window diagonally down towards the corner. I glued and riveted a piece of white aluminum trim coil metal over the crack. Worked fine and did not look to bad.
On our last trip the door blew shut hard again and created several more cracks. They all got the same fix.
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