You would be surprised how much condensation a series of storm waves will produce inside your unit. Basically, you've got 100% humidity outside. These things are far from air tight, and you get a good cold rain (high top thunderheads) and yes, you could very easily get that much condensation inside with a good temperature differential.
Steve and Lisa
Un-tethered buoys in the shipping lanes of life.
Jayco Jay Series 1206
Dodge Ram 1500, Hemi