I was actually talking to the service guy because all the salesman were busy when I called. I would have been a little skeptical too if I was talking to a sales guy.
I was a Jayco owner until I sold my trailer in December so I am a member of the Jayco forum also. I posted the same question on that forum and nearly all responses are that there were problems with dual pane windows fogging - typically after about 4 to 5 years.
Members on this forum aren't having problems? Maybe Redwood uses a different/better manufacturer of dual pane windows than Jayco?
I started this thread because if dual pane windows are a known issue and RW doesn't offer the option of single pane, that weighs heavy on my decision to purchase RW or not.