Loudness is a relative thing.....
My trailer has plastic waterlines that run from the pump
across the top of my water tank on their way to the
hot water heater and then the rest of the trailer.
One of these lines was laying on top of my water tank.
When the pump ran, it jumped up and down and drummed
on the water tank.
THAT was noisy!
A little further down stream this same line was
touching the wall between the pass thru storage
area and my wife's side of the bed
Do some investigation and see if you can simply cushion
this or that water line to keep it away from walls, tanks,
Small investment in time can make a big difference.
You can get foam pipe insulation at big box home
supply stores. One piece cut up will be all you need.
You can use a towel or a rag in a pinch to stop any
drumming. Hold them in place with zip ties or just string.
Welcome to the world of RV camping!