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The main problem is air being sucked in with the water from outside or I found in my case, a restriction in the outlet from the internal tank.

Air causes 'cavitation', (you mentioned boats?), in the pump head and this noise is amplified by the floor if the pump is not mounted correctly.

This has to be rare but I also found my internal tank connections bore was just 6mm diameter!! this made it impossible for the pump to get enough water to satisfy it's abilities, increasing the bore to 10mm sorted that out.

Placing the pumps mounting board on a piece of breathable groundsheet stopped the amplification and once I cured the air leak the pump is now all but silent.

Another possible cause of noise is semi rigid pipework vibrating on whatever it's touching, again though getting rid of the air should also cure this.

We have a 2008 Caravel and when we first had it the noise was quite annoying.  The following three things have really improved ours. I smear a bit of olive oil round the 'O' ring inside the water inlet on the side of the van,to prevent it sucking air in.  Put some tension on the sponge pad between the pump and the accumulator. Remove the plastic clips that secure the feed pipe to the floor  now put a length of foam pipe insulation on the pipe from the valve to as near the inlet as possible.