Our 2007 3400 has dual panes and they all open (haven't tried the 2 emergency windows yet). Temps so far from 20 to 115. Last 5 weeks we camped in my sister-in-law's parking lot 150 feet from one of the busiest interstates in western NC.
Would not ever order another 5th wheel without dual panes. We love them. I know this is just my opinion, but I'm convinced.
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