If you're "seeing daylight" between the floor and the sidewalls, it's more than "a "soft strip " of flooring & a bow where it is supposed to attach"....
It sounds like the slide floor has separated from the sidewall, either because of rot or from construction failure. People sitting in chairs at the table may end up "outside under the slide". Some photos of what you're seeing would help with making constructive ideas, but the "visuals" indicate a significant problem that needs immediate attention from a structural perspective.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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