Kingsport 236 - Access to water lines in bathroom

[JRSturgeon]

The water lines to the bathroom fixtures (sink & shower) in our 2010 GS Kingsport 236RB make a LOT of noise when using the water pump (not connected to city water). I'm sure it is just vibration from the pump being transmitted through the lines and banging against the wall in the bath. My question is: Is there a way to get to the water lines, either from inside or underneath the coach, to try to wrap or tie them so they don't vibrate? Since the underside of the unit is enclosed, is there another way to get into the rear wall (where the noise seems to be coming from)?

Thanks for any suggestions!