It's common.Older trailers especially.
A good thing to carry with Airstreams, is a big roll of 2 inch wide, Silver color, Gorilla Brand duct tape.About $9 at Wally World.
NASCAR racing pit crews call it 200 MPH tape, for taping damaged cars.
Good for sealing loose windows, when latches are broken, say you just buy a used one.Tape them shut, before towing home,you don't want them rattling and breaking.
Same for loose hatch doors, sealing leaking windows,leaking roof vents, etc etc.
These Airstreams arnt the 8th Wonder of the engineering world.
And, it matches the Airstream...