Originally Posted by mustang
I get a dent in mine right over the right side axle at the roof.When the sunn beats on it I hear poping then in the eve when the sun goes down popping again and dent gone
What you have is called an "oil can" dent.
Many Airstreams have them, but few people ever notice them.
They hurt nothing and cause no problems. Sometimes it may take years for them to quit, or years for them to start.
It has been suggested, that how the trailer may be parked, or loaded, can cause the oil can dents.
Fortunately, they are not permanent, and do not cause any creases in the metal.
Sometimes, a few rivets can be removed from the area, and let the trailer alone for a few days, especially in a hot sun.
Then enlarge the holes and install "Olympic rivets" with vulkem, of course.
That process has been known to correct the "oil canning" some of the time.