We have a 2017 Thor Quantum RS26, purchased new May 2017. Our rv is parked in our garage when not being used. Sometime after the warrenty expired I noticed what Thor calls (a wave) on the back cap. I was told it is normal and cosmetic only. How ever within the last week a small crack appeared. I drilled a small hole at base of hole and caulked. I will check every few days to see what happens.
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