Your roof is out of warranty at 10 years (If you are the original owner and have documented roof inspections 2-times a year).
In the past, Winnebago has advised that bubbles are not an issue. I don't know about one that large. I have two bubble shapped bulges on my roof.
Do you know if a previous owner did anything to anchor down the roof at the drip rail? Because if they did than chassis flex could cause that. In fact, even if they didn't chassis flex could certainly be the cause.
Now... what to do about it? I don't have a suggestion to offer. Perhaps send the photo to Winnebago Customer Service and ask what they suggest.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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