[thenewkid64]

Vista views were double paned for strenth and thermal properties. The other windows being single pane was standard, but an upgrade option was thermopane all the way around. My understanding is that Airstream has had tons of trouble with the "thermopain" technology and discontinued it.

I did Andy's trick on my 77 Soverign and it was nice to have the clear panes. You may want to invest in a spring punch that is offered as an escape tool from your car. This is about the size of a pen and has a small punch that will not extend too far so you only break the inner pane. It is not, as I remember, safety glass or tempered glass so it will shatter into a million pieces, hence the tape.