We had dual pane windows in our Class A, Allegro Bus. AND they were a pain to say the least. Seems dual pane windows don't particularly like bouncing down the road and the seal lets go and guess what?---Foggy windows. I can't begin to tell you the number of coaches at Red Bay (Tiffin factory service facility) every time we went there for our yearly "fix it" stop on our way south for the winter. Yes, they do work when the seal in in tack, however, the cost to replace and inconvenience of having them replaced or looking out foggy windows was definitely not worth it! We've owned 12 different RV's over the 30 years of camping, only the Bus had dual pane windows, and unless they get this issue under control I'm not interested in having them ever again!!!!!
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's