Welcome to the forums. Not sure I can help, I'm not familiar enough with your model.
But one thing is certain, water does not run uphill. Above the wet spot is there an air conditioner vent or duct? Is there a sink or a toilet or a bathtub near the wet spot. It could be a leaking water line, it could be a leak coming from the roof, down the walls and across the floor. And it could be condensation dripping from somewhere.
Are you camping in cooler weather right now and running the furnace? Condensation inside campers is a common problem and enough water can condense on walls and windows and behind the bed mattress to actually cause puddles.
Has the roof been inspected lately? The tiniest crack in the calking can cause water to run anywhere from that point downward.
Again, more information is needed on your specific situation. There are just way to many variables.
But .... welcome to the forums! We're all here together to help each other! Just jump right on in.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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