Well, I wouldn't call the new pump installation "quiet," but "acceptable." It's much, much better than the jarring noise we used to have. Before I moved the pump the whole trailer seemed to vibrate when the pump came on.
This is the old location, under the curb side dinette bench. The pump was installed just inches from the fresh water tank outlet, and the cold pipe went through that little opening toward the sink.
This is a picture of the same location where the pump used to be installed. Here you can see the pipes that originally clamped directly to the OSB trailer floor around the perimeter of the trailer, snaking around the wheel well and other obstructions have been re-routed. They're now firmly zip tied every 12 inches to holes drilled in the curb the back of the dinette benches rest on. Not only does this reduce the amount of free movement the pipes have, the curb is covered in "rat-fur" that reduces the transmission of vibration.
The new location for the pump is under the street side kitchenette cabinet where my converter and solar
charge controller live. The pipes that used to snake around the wheel well clamped to the OSB floor have been re-routed and strapped to the rat-fur cover of the wheel well hump. There is a much longer length of flexible pipe to the re-located fresh water tank, and while the connection between the pump and cold water line is just four inches long, the water pipes are flexible PEX tubing with over a foot on either side of the pump connection before they are firmly secured to the "curb" at the back of the dinette or to the wheel well hump.
I've never used PEX pipe before, but found it was really easy to work with. The only downside is the pipe "T"s "L"s and unions I used are very, very pricey, $3-5 each, but don't require any special tools to install them. Less expensive $1-2 fittings are available, but you need a $80 tool to clamp them in place.