I've had dual pane windows in 3 RVs now and have not had the seals go. I'm familiar with the problem as I have had them go in my house. Two Bigfoot campers, both with dual pane everywhere, not one failure over 25 years. Had them in my Safari motorhome too, no failures, but only owned that for 6 years. Maybe the brand/manufacturer makes a difference?
I like them, partly for the thermal insulation, but not mentioned so far is the noise insulation which is very noticeably better than single pane. In today's crowded and noisy campgrounds I'd buy them for that alone.