There are some variable speed pumps that are pretty quiet compared to the standard pumps installed by Gulf Stream and a lot of other mfgs. You will want to mount it to a very firm and dense surface but isolated by rubber feet. The water lines need to be flexible and coiled around in mid-air to allow vibration to disipate before being attached to the pex pipe.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7