I took a closer look at your picture, and noticed that a patch had been riveted over one segment, and that the damage involved creases rather than simple dents. Dents can be made nearly invisible with suction (plus a bit of luck). Creases require replacement. The type of aluminum alloy used by Airstream has changed several times over the years, additionally the front and rear ends used to have different profiles: for instance, theer was the "whale tail" unique to the old California factory. The one you are looking at is a 5 segment model, but not the most recent profile. Anyone wanting an invisible replacement will need serious skills with an English wheel or a donor trailer which is being cannibalized for parts, or both.
If the damage doesn't leak you could choose to live with it, otherwise letting this one go to a professional renovater who has an inventory of carcasses might be more advisable.
If you have serious money to throw around, you could always look up the custom build Bowlus Road Chief. (That suggestion is me being totally EVIL. This design was brought back from the dead and its quality leaves Airstream in the dust. The price tag - get out the smelling salts. The upside? You can tow it with a full size sedan.)
Seriously, if you are hunting for a gently used Airstream, right now the happy hunting ground might be right where I am - Travelers Rest and Resort in Dade City Florida - a retirement/snowbird community where there are 20 which have not moved in 10 to 20 years.
Today is a gift, that's why they call it the present.