Another thing to inspect for is...
Something I and others have noticed and have declared to be an Airstream design flaw is the way they run the trailers electrical connect lead through the inside of the Hitch/A-frame 2X4 steel channel. Although it makes a neater design, running the cable on the inside of the channel allows water to "wick" down the cable along the inside of the channel, letting moisture seep into the inside causing severe corrosion. In my case I am going to have to cut out the curb side A-frame member and weld in a new piece from the hitch to were it joins the frame. The power lead will then be rerouted on the outside to avoid this moisture trap. I am posting a picture to illustrate this design flaw.
Of course, it only took 37 years to manifest itself.
-"You want to make it two inches - or, if you're working in centimeters, make sure it's enough centimeters for two inches."-Red Green