Newbie with an issue

OK. I didn't realize it was glued from the factory. They have re-caulked the front edge several times with no change. They checked the horizontal crimp on the front of the TT (it's probably half way up) still no change. The only time they seemed to make any headway is when they started sealing under the trailer(cut the size of the bubble in half). So I'm worried that it's going to happen again becouse the problem has not been found. They cleaned house with the service dept so when I tell them you were on the right track they don't know what that track was. My luck..