Based on what we were told during a factory tour, the floor is "Structure Wood" made by Weyerhauser. They use it because it can be obtained in huge sheets that allows them to make a one piece floor. This eliminates joints in the floor, and is supposed to prevent squeaks. I think it is just as good if not better than a plywood floor.
The only suspension problems I know of were with Alko axles. Alko replaced some devective axles, but Kestone "fixed" that problem by switching to Dexter axles which seem to be heftier. (This is all relates to Montanas. Mountaineers are made in a different plant, but I expect the above holds true for them as well - take a look at the little rubber caps on the hubs, and see if it says Alko or Dexter).
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