My 2014 Laredo has this same thing. Don't know if it is water damage like people say or not. I have noticeable smells inside the trailer that would indicate mold or delamination, and the whole wall is very stiff, just not roll press bonded like the other walls.
I was concerned about this when we first bought a year ago, called Keystone and was told that the rear wall in that year was not roll laminated like the outside walls. The inside panel/wall is assembled first, then the outside panel is assembled last after they fill the cavity with insulation and run wires.
Never took up the project of tearing into it, taking off the aluminum strips around the panel to see if I was lied to.
Interested in the thread as well.
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