Use Accumulator Tank on RV
I put an accumulator tank in my 5th wheel trailer for the same reason. It works well. One big advantage was that at night I can turn off the pump and, if I need water, the two gallons in the tank takes care of it. One thing that may or may not be a problem. With a tank, while the pump is building up the pressure, the pump runs under a heavy load for an extended period. After using it for several years, there have been no pump failures.