For those who are looking and researching 5th wheels.  One thing I really like are the Frameless windows.   This is our second 5th wheel with frameless windows.   They in my opinion are far superior to the rubber framed windows.    The frameless windows are roll out, and can be left open when its raining and you want have to worry about water entering the 5er.   I think in the future,  framless windows will be in all 5th wheels and yes they are dual pane.   GBY...