Not really sure about a Fred Crescendo, but the previous coach was a gasoline motor home and the cover was held down with real long flat head screws which a person could not see because of the carpet. Maybe if you look real close it might have something like that holding it down.
2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox