Mold on dinette frame under cushions
We recently purchased a new-to-us 2020 Adventurer 89RB, used all of 6 times by the original owner. While looking in all the nooks and crannies to get to know our new truck camper, we discovered surfa...
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Looks to be moisture from above to me. The water heater is a sealed and insulated unit that looks dry and mold free on its bottom area, that we can see anyway. Water can and will enter at any exterior penetration like marker lights, vents, windows, etc. and also can travel along framing members until able to run downwards. I'd start by cleaning and resealing every exterior penetration.
the only issue I see with "from above" is the mold stops at the hight of the seat cushions. it makes me think there was some sort of high humidity/storage type thing going on.. or direct moisture under the seat. but ya it could have been leaking down the inside of the wall and just coming out at the bottom.
What's noteworthy is that there is no mold in the joint between the frame and wall. Only surface mold in the form of black spots at the top and bottom of the panel that's the dinette seat and the same surface black spots on the top of the frame. The most severe mold (extensive, fuzzy growth) is on the "inside" lip of the frame and on the underside.
