With a quality water pressure regulator vs. the cheap $10 jobs, you'd be surprised that you don't need to really increase the pounds all that much. I think mine is set somewhere in the ballpark of 40-45 psi (I haven't looked at it in a long, long time). And we never have complaints about water pressure.
I bought from RVWaterFilterStore.com
and got a Watts regulator. Expensive, but quality components all around.