"Flimsy" is not what the other owner meant. He was proabably referring to the fact that the upper shells in the older models were framed with wood. If the owner let the caulking deteriorate, then water got into the walls (just like caulking arund the windows in your house). In a few cases, the water rotted the wood framing, requiring that it be replaced. Not a pleasant job.
Starting in about 2002, TM eliminated the wood frame in the shells, and starting using aluminum.
If you search the forum for the word "wood", you'll find a lot of info.
Bill
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