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I have water damage on the inside outer wall of the ALDE-Nautilus wall. It is the worst from the Alde vent back to where the bottom starts to slope up.
My nautilus box was sealed against the large gap at the bottom against the Azdel panels; but when I took a close look at the outer nautilus exterior black door, I could see dirt and water leakage up at the top inner bottom edge. I removed the nautilus exterior black door. The factory had over cut the height of the rectangular hole in the Azdel panel to mount it. When they slapped it in place with sealant and screwed it in with the self-drilling #8 sheet metal screws, one screw was so low it made no contact at all. I cleaned everything up and sealed it with butyl tape, centered it and remounted it. I also sealed the horizontal gaps 80% up from the bottom of the Nautilus box and inside of the  Azdel panel with sealant.
The foam stopper looks like a great idea and I'll add one to out 2021 TAB 400 Boonedock.
I would note that every car I've ever owned over the past 55 years has had a check valve style drain, or removable rubber grommet seal in the bottom of the trunk areas in case of trunk rain intrusion or spills.
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Why doesn't nuCamp have a drain in the bottom of the ALDE-Nautilus compartment for all of the leaks that I have read about on this wonderful and informative forum?
This would prevent the rotting wood on the lower interior sidewalls and wood structure below the linoleum making the bottom of the trailer bed.
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