That makes some sense. On my prior SOB I never had water to collect in the under belly.I had lots of water in my underbelly. 09 BH 3670. Spent two years trying to find the cause. In the end I got a hose and ran water on the roof watched it come down the back courners on both the curbside and driverside curl under the rig and onto the frame. I placed weather striping there to acted as a stop and have the water drop off. No more water in the underbelly! Hope I have explained well and it works for you also.
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Don