Condensation is caused by increased humidity inside the coach. It "condenses" on the cool parts of the RV as the outside temperatures go down. The window is one of the places where condensation collects. I'd be concerned that there are other locations that you haven't identified. Places like the area where the mattress meets the sidewall, the sofa backs up against the sidewall, inside cupboards that are mounted on exterior walls, especially in damp locations such as in the bathroom and near the kitchen sink.
You can reduce condensation by lowering the humidity inside. A dehumidifier, using exhaust fans when showering and using the range hood fan when cooking. If you still have a problem with that large window once you've reduced the humidity, you might consider a small fan placed on a flat surface near that window with the air blowing over that location.
The problem with humidity is that it very often doesn't "show itself" as you're seeing on the window. It's the hidden locations that collect moisture, don't get "aired out" and mold starts to grow. Check your mattress, the cushions on dinette seats and behind the sofa/TV seating.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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