Years ago, in my 1982 Foretravel, I was camped near Winterhaven, CA when strong NW winds blew off one of my AC shrouds. I watched it tumble and break into pieces as it headed towards Mexico.
Today, I am camped in NV and experiencing strong winds from the SW. The outside cover for the bathroom vent/fan assembly just blew off and broke into several pieces before coming to a stop in some high grass. I fetched the pieces before they went any further and it looks like I'll be buying a new cover.