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Those are stress cracks caused by broken welds in the aluminum frame. It is time to peel the wall back and check welds. While not as common as the cracks in the front bedroom slides, the rear den models are not immune.
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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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