I assume you lost one of the treads while traveling. One of mine was beginning to come loose. To prevent further detachment or loss, I put a stainless screw in each end of both mats (2 screws each), screwed into the fiberglass step. They look like they are supposed to be there.
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Mark & Susan
Former MBS 24R and 2401W Owners
Just recalibrating our camping set-up for now!
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