I looked at your floor plan and I watched this video. At 3 minutes 48 seconds, he steps into the bed room. You can see the roof vent and you can see the washer-dryer prep.
to see what your camper looks like. I see in the bed room you have a ceiling vent right above the bed. And there is washer and dryer (prep) in the closet.
Considering the floor is wet in only 1 spot, I would guess it's getting wet from the vent above the bed.
Have you had rain recently?
Water flows down hill, never up hill. If there is a water leak in any of the pipes leading to the washer dryer prep, it will be under the floor. The pipes under the floor would need to leak (up hill), and spray through the floor first, and the floor is most likely a sheet of plywood with carpet on top of that. The likelihood of that happening to the point where the carpet is actually squishy, well, I have a hard time believe that.
More than likely the water is coming from the vent directly above the bed. Check for wetness around that vent. Check the seals (caulking) on the roof around that vent. If you can, remove the trim from the vent on the inside and see if there is water in the roof.
If you "think" you have a water leak, an easy way to figure that out is real, real simply.
1) put water in your fresh water tank
2) disconnect your garden hose from shore waterr
3) turn your water pump on and let it pressurize your water lines.
4) if you have a water leak anywhere, you'll hear the water pump running. It takes only about 3 ounces of water for the pressure to drop low enough in the water lines for the pump to cycle on and off. So if it's running constantly, or if it's cycling on off, on off, on off, just that quick.... you have a leak. You can hear the pump. If the pump makes no noise, YOU DO NOT HAVE A WATER LEAK anywhere.
The leak cannot be from a drain line ... water flows downhill and drains are not under pressure.
My guess, it's coming from the ceiling skylight vent.
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