Roof ballooning up!
On our last trip we were twice passed by an RV, trailer, where the roof covering was ballooning up about 14 inches into the air. It had a middle seam so ther front and rear balloons. Reminded me of the old convertibles going down the road when the windows were closed.
I'm pretty sure it was a rubber roof.
We also saw a awning ripped off from the MOTORHOME in a micro burst at the Grand Tetons. There was plenty of warning ahead of time.