As I was trying to pin-point the final source of my leak, I posted several threads - this was my last, so I'll round it out here ...
My leak turned out to be caused by a sloppy installation (at the Thor Factory) of the "360 Siphon" vent stack on the roof.
Because the pipe was cut jagged & was also not glued per the 360 Siphon installation instructions ... rain water was getting past the "screen" in the 360 Siphon. Instead of the water just running down "inside" the pipe to the holding tank(s), it would make its way to the outside of the pipe and run down inside the wall (bathroom wall on the A.C.E. 30.2).
I removed the old vent stack, leveled the ABS pipe, and replaced all with new. I had trouble getting the screws to bite, but it is what it is at this point.
This is a hidden area .. and I'd have never known if I'd have not pulled the bathroom vanity drawer out and looked underneath during a regular inspection. Something to think about if you also have a A.C.E. with a similar design.
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