Water leak
This a shot in the dark. Someone would need to have a MH like mine to be able to know what I am taking about. I have a leak in the back bed room under the bottom drawer next to the closet. If you are ...
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Your floor probably is made up of a sandwich type construction. This has waferboard or a plywood wooden top with a core of foam for insulation. If this foam has become saturated with water, either from an internal water leak or from water being thrown up when driving in the rain. this saturated foam will continue to wick water in to your carpet until it finally dries. I would suspect that it has already destroyed the top wooden layer.
