Sorry, I don't have any fix it yourself expertise to help you. Fortunately, I have never had a problem like that with my hybrid and looking at mine, I am not sure exactly how water stays out other than the seals around the door frame.
Given that you haven't received any responses from handy people, I would try the Contact Us on the Coachmen website or call the factory to see if someone there would be willing to assist you.
They will probably want your year, model, VIN and the pictures.
Good luck.
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2016 Ram 1500 5.7 Hemi
2019 Coleman Light LX 2405BH
2015 Chevy Traverse
2011 Chevy Traverse (traded 2018)
2014 Solaire 147X (traded 2019)
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