MitchF150 wrote:
It's not the pump itself that is loud... It's the vibration that goes thru the pipes that is making the noise..
Exactly. Run any of these water pumps on a workbench and you'll barely hear it run - installed in a camper what vibration the pump does make is induced into the floor and adjacent walls of the camper and is amplified. The true solution is easy - isolate the pump itself by mounting it atop soft foam AND add a l-o-n-g length of soft braided water hose to the output, looping it and wrapping it in an old soft blanket. I did just this several years ago and the pump is so quiet in operation I had to add a light so I'd know when it was running. Pics and a video
start here.