Keep an eye on this long, narrow "bubble". Over time, it may develop into a wider one or worse still, other similar bubbles will appear.
I'd measure it, take photos and write up something to send to your dealer and/or Keystone. Keep detailed written records of your findings, any emails or phone calls you might make. Check your roof frequently, take additional measurements and photos. Keep in contact with the dealer and Keystone.
You didn't mention if your RV is still under warranty or its age.
As a note, a friend of mine had a roof that looked somewhat similar and he was told the same thing --"Don't worry. It's normal". About a year later, the entire front section of the roof worked loose and was billowing about while driving down the freeway. It was out of warranty but the dealer did repair it but only reluctantly. The owner kept detailed records, photos, etc. which helped him immensely in his effort to get this "normal" problem fixed.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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