Yes the glass is floating, vs glued down. Hard to tell by just this listening, but that sound like soft/rotting material in that section. So possible that water has intruded thru non sealed penetration point, and as water does - mysteriously settle in a section seeming miles away from the leaking point
! The other coach you mentioned, would probably have been delimitation due to water intrusion...
Water damage in that edge of the roof near the curve, could have worked it's way down into the side wall area too....
Water leaks, left unattended and festering, can result in structural problems, and if not structural, mold can take hold and cause health problems.
Unless the inspector, and grounder with a similar Tribute, can confirm this sound is consistent in all areas, I'd get a more thorough inspection. Better to be sure then sorry
(I'll share that our 04 Allure, did have an leak in the front right side where the Air Horn penetration for the air hose was. Previous owner did to catch it. This resulted in us holding off on the commitment to buy the coach, until the CC Dealer that had it in on consignment (And whom I had a salesman assisting me in a nationwide search.) got into it enough to see what needed replacing. Ours required about a 10" repair of the roof substrate, as well as we had a metal panel patch sealed over the the areas where the fiberglass had to be removed to do the repair. We also treated the wood side up towards the very top, behind the entertainment cabinet to the left of the door when we stepped in (You could see where moisture had wicked down about 10 inches or so.) to prevent mold. So it was caught early enough, and the repair and my inspection during the process was a part of us moving forward on the purchase. No long term problems...)
A deeper review by someone who knows CC coaches - is probably warranted.
That is all IMO. Good luck,