Good catch, Mike. I posted based on a hasty and entirely wrong mental picture, so I will mod my post.
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Jim -
Yes, the floor (as opposed to the shells) continues to be framed with wood. Rather than trying to insert longer lag bolts into the rotten wood, you might do better to use a metal backer plate inside the TM as the factory suggested, secured with bolts down through the cage, and nuts below. Make the backer plate long several inches longer than required, and put a couple long wood screws down through each end of the plate into the (presumably solid) wood below. It won't be entirely pretty, but if you use bolts with a rounded head like a carriage bolt, it won't be bad and it might be strong enough. Paint will help, too.
I hope that the wheel wells don't get involved - that would make it a lot tougher. Looking at pictures, I can't tell.
Sorry to mislead with my earlier post.
Bill
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