It sounds like the check valve that is internal to the water pump has failed. A "loud pump" is usually actually the pex piping in the trailer banging against a wall/component and finding where the piping is rubbing against something and putting insulation around it will quiet things down.
You can unscrew the inlet screen to the water pump and turn on city water, see if water comes out the inlet of the pump. If yes, the check valve in the pump has failed. Sometimes just running the pump will clear debris out of the check valve and fix it.
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