I am the friend he is referring to. Mine does not have the front storage compartment like some models and the front outside black trim piece which sits at floor level was stapled all the way along it’s length. The staples perforated through the underlay tarp material and went right into the flooring. Any water coming down the front of the trailer would pool inside the trim (no caulking here either) and could go through the holes and saturate the OSB floor. That’s my theory anyways. Whose idea at the factory it was to staple the trim I’m not sure but it seems like a poor design choice! I removed the staples and caulked along the trim. Have kept the trailer covered as well. So far no further water damage has occurred.
We have a 2004 Clipper and will be working on this repair in the fall. We do have a storage box with a nasty crack in the lid, and both ends are rotted out. We got underneath and lesser damage continues along the passenger side from the storage box, under the cassette toilet and just to the right of the door. Looking at your photos, I'm not as intimidated by this project as I was before, so I appreciate seeing them!