If the window you speak of is in the back wall of the motorhome, perhaps it’s been made so that it can’t be opened for ventilation. I vaguely remember hearing once that “rules” prevent having the rear window open because exhaust fumes could be drawn into the RV while traveling. Or maybe I heard that wrong.
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2020 Sunseeker 2440DS on 2019 Ford E-450, Trekker cap, Topaz paint
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