Probably depends on where and when you do your camping. In the Great North Wet, now that we have had them, we wouldn't be without dual panes. Condensation is a real issue with single pane windows in this part of the world and the dual panes eliminate it. They also make the unit more comfortable when camping in cooler weather, particularly if you are sitting beside a window but I doubt they make much difference when it comes to noise.
All dual panes suffer from delamination eventually. That wouldn't stop me from installing them in a home (they're code anyway) so why wouldn't I put them in my RV.
Eleven years ago when we bought our present fifth wheel, perhaps 20% of the new units we looked at in this area had dual pane windows and only in the higher end models, now it is probably closer to 70%.