Hi,
I have the same model as you except mine is a 2013.
On my TT, there is about a 1 square foot cutout of the coroplast used for accessing the slide out motor in case you ever have to manually crank it in. This cut out would be a good place to poke your head for a visual inspection of the floor supports.
Climb under yours and see if you also have this cutout.
Take care and let us know what you find,
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Lee & Christie
1970 F250 Highboy 4x4
2013 Cougar 21RBSWE
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