You didn't mention whether you'd had any rain, so I'll post my experience.
We had water coming out from under the bathroom cabinet and I checked all the drains and pipes but all was secure.
Then it rained again and a day later, we had water coming out from under the cabinet again.
It turned out to be the power cord hookup. The socket on the outside wall had been very poorly installed with the screws stripped through the thin wall material. To try to fix that someone at the factory just drowned the top of the plug with silicon sealant. The lid of the plug was perfect for funneling the water into the gap behind the plug.
When I came up with what I thought was the cause, I proved it by having DW watch the inside while I sprayed the wall outside with a hose.
I replaced the socket with a new unit and gasket and mounted it with bolts, nuts and washers for a secure attachment.
Problem solved.
As I said, it depends on the design pf your trailer.
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