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 ...
As ksg said. Turn on the water pump and listen for random short cycles. It often indicates a very slow leak in the plumbing. It's common for the crimp connectors to leak after a few years or more.
Do not have the shore water connected while checking this. After that, shut off the water pump and relieve the pressure by opening a faucet, now dry the carpet and see if it continues to get wet. If it gets wet, you most likely have an exterior leak.