Usually it not the pump, but the PEX lines that are hard mounted to the pump that make the noise. The pump is mounted on four soft rubber blocks so there is not much else you can do with the pump. If the pump is mounted on a thin piece of plywood, a small section of 1/2" plywood under the pump and on top of the thin original mounting position might help. Shurflo males a kit to quite down the pump. <https://www.amazon.com/SHURFLO-94-591-01-Pump-Silencing-Kit/dp/B000WN5F96>. An accumulator also helps quiet the pump noise. Finally you probably have a constant speed two piston pump. Several companies market a five piston variable speed water pump all will be a little quieter than what the coach's original pump.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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