It's the felt from the slide seal
It's the felt that is part of the lower slide seal assembly. I'm sure someone will post the exact arrangement, but it's part of it. I'd guess it either blocks wind/noise or helps wipe the bottom as it travels.
Let's see what others have to say,
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1998 Signature 42' M11 450hp - -pulling 25" enclosed trailer with SCU sandcar inside
Lovely Wife, 2 kids, 3 dogs, 2 cats
Diesel Mechanic to the stars
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