Most likely a seal on the edge of the roof is letting water in and running down a wall and somehow making it to the middle of the floor. Before starting the work you're going to need to find a way to track where the water is coming in. Could also be along the door frame, or a window.
You might try having someone hold a hose at different places and work around the trailer until you find it.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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