Last two fivers have had dual pane glass. Granted it isn't the same as dual pane windows on a stick house, but it makes the way the fiver takes hot and cold infinitely better. As an added benefit ... it cuts down on campground noise a bunch. I don't know the weight difference, but it wasn't something I was worried about on either of my last two fivers. You'll get some saying there is no noticeable difference ... denial is a peculiar thing ... Ha!
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