John -
I think you have been misinformed just a bit. Wood framing in the shells stopped in about 2000 or so. I know my 2002 2720SL had aluminum framing in the shells. Wood framing in the shells has been associated with rot if it was allowed to get wet, but was perfectly good if kept dry.
TM has always used (and to the best of my knowledge still uses) wood framing around the perimeter of the floor. I have never heard of a single problem associated with this wood.
You will find a lot info by using the SEARCH tool on the word "wood". Unfortunately, you can't search on "rot", since the search tool needs at least four letters.
Bill
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