Roof damage on a Four Winds Chateau I'm looking to buy

Had a new TT with a bubble 7 feet across the TT and about 4 inches wide on a seam in the decking. It was due to the failure of the glue and manufacturers will tell you it is not detrimental to the integrity of the roof. Often considered putting eternabond over it but instead just inspected a few times a year and never had a failure in 8 1/2 years owning that TT. Good luck.

Doug