Not sure if your underbelly is the coroplast material or not but last year I had very similar symptoms with our enclosed underbelly. Turned out to be water running down the front of the unit and onto the frame, then dripping onto the edge of the coroplast that was sticking out about a 1/4" or so past the edge of the frame. From there it would run back and pool in the underbelly until I moved the trailer or lifted/lowered it enough to let the water find a way out. I noticed it was only a problem when the trailer was stored and in part due to keeping it slightly nose-high to run the water off the back when it rained. It would also happen when I washed it. We were fairly early into our warranty so I took it back to the dealer and they dropped the underbelly to confirm it was dry at that point and then caulked along the coroplast where the problem was occurring. It's been dry ever since. I posted a couple pictures in this thread of the problem area before and after the fix:
http://www.jaycoowners.com/forums/f4...eak-31685.html
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TT: 2019 ORV Timber Ridge 23DBS, Blue Ox SwayPro 15K/1500
TV: 2019 Ford F-250 XLT SuperCab LB, 6.2L, 4.30/e-locker, 4x4, 164" WB, RoadActive Suspension, 3216 payload
TV: 2014 RAM 1500 Big Horn CC (Traded in)
TT: 2015 Jay Flight SLX 195RB Baja Edition, Andersen No-Sway (Traded in)
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