When we had our sticknbrick in SW Florida we closed it up but never left our RV down there in the summer, so I can't address the "vents open or vents closed" issue. I will say that I had a new 10'x16' shed in the back of the property which had open gable vents. It never was damp inside or had mold.
As far as critters control goes. If it was me I would get a couple boxes of moth balls from Lowes. Each box has 2 perforated bags. I would toss them under the RV to keep snakes and several other unwanted things from hanging out or coming around.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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