I agree that Airstream pattern baldness and leakage are two separate issues. If APB led to it, I'd be sloshing in mine.
Noneternal sealant and the nonrigid necessitiy of a semi-monocoque floating frame on chassis design that ensures endurance are the factors that should be considered.
My trailer has advanced APB. I could do something about it, but I just extend the awnings and don't worry about it unless I find a leak.
Then it's warfare!
Thanks to this forum, I know what to check first. It all depends on the model of the trailer.
Fortunately, my Excella gives me little to worry about with its hip-mounted running lights and double pane windows with their very visible seals, but I do need to get on top next year and do some maintenance. (Vents, vents, vents, and checking the rear end joint for security.)
And If I can't find a Skyliner antenna that will mate up with the existing (and working) other parts in between the skin, I'm going to remove the ineffective batwing antenna and go with a pair of rabbit ears outside. I think that a dipole antenna that needs an amplifier to work for local signals is a bad joke. This is an example of how the design has *not* advanced.
1975 Argosy 28 "Argosy"
1979 Excella 500 31 "Betsy"
1992 Lincoln Mk 7 LSC
2003 Dodge 2500 Cummins "TowHog"
"Lucy Loosehair" the cat - Airstream mascot
Klaatu barada nikto