I think your bathroom is in that corner of the trailer on a 21', so I would suspect a leak in some of the bathroom plumbing. Turn off the water supply/pump, remove the pressure, and wait and see if the dripping stops (which would indicate a water supply line leak).
We recently had a small leak in our 5.0 TA at the fitting inside the street water connection. It dripped on the floor under the passenger side bench then ran off the floor to the bottom of the trailer and dripped out a hole just behind the left rear tire. Tightening this fitting about half a turn (after removing the water pressure) solved the problem. I checked all the other water fittings I could find and I found some could be tightened a little. This may be a good thing to check every few thousand miles or once a year.
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Thomas G.
2017 5.0 TA
2017 F-150, 5.0L, SuperCrew, 6.5' bed, 4x2, 6-speed, 1:3.55 rear axle; B&W Turnover Ball; Andersen Ultimate Aluminum Gooseneck; Fold-a-cover w/caddy
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