While that problem isn't very prevalent, it has occurred to some of us. In my case it was the trim strip which hadn't been attached too securely. The dealer repaired it under warranty and 3 years later it is still holding on.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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