I purchased a moisture meter, same brand, but not that model. I am pressed for time. I start 6 out of 7 straight nights tonight, then I'm getting married and honeymooning, so I felt like I needed to get some readings ASAP. With that schedule, I'm not sure what I'll be doing with the readings detailed below, but I felt like it needed to be done anyway.
In short, the readings were a bit frustrating. On the floor/outer edges of the trailer, I got high relative humidity readings, but after looking under the trailer, I see the frame and then some flooring overhanging the frame to the outer edges. The readings seem to be about that width in some areas; in other areas they go farther inward toward the middle on the floor.
Around the doors, they were pretty dry.
On the floor inside the entryway, the floor was "wet" but again, about the width of the overhang. This "width of wetness" extended forward as far as I could reach, so again, I wonder if it is picking up something structurally metallic.
Under the bed where there was a lot of wetness, with towels and sheets soaking up a lot of it, there was very little issue there, I believe.
I took several readings on the ceilings. All seems clear.
On the inside of the front wall (in the front storage area), it seems to be pretty dry. I was worried about that external horizontal seam, but it seems to be performing properly.
Notably, I get almost exactly the same readings on opposite sides of the front storage area, and both extend inward on the floors about the same amount. One side is on a pretty good slope from the other.
Everything feels appropriately solid, especially the floors. I've pushed and banged on them pretty hard; I don't mind making a hole if it means I found the trouble spot; the hole would have needed to be made anyway.
Summary: Still not sure what's going on, and I don't think the moisture meter was all that helpful. I'll read the writeup on the other forum you did, John. I did the moisture readings and this typing in a hurry because I'm going to bed now. (It's noon).
Larry