"At any rate, I am going to take a closer look at the other fasteners on the RV."
Remember, you were changing a light bulb!......
My understanding is that they use a tubular aluminum frame, but the walls and such are this plywood core stuff.
& I have always cringed when I see repairmen working on my house and sinking screws into exterior surfaces without bedding them. I guess the compression between the substrate and the thread form some what of a seal, but as you say capillary action can be quite strong.
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