A basic water pump (4008-101-E5) is rated at 3 gallons per minute. An upper level one can pump 4 gallons per minute. They typically work at 45 for the 3 gallon pumps, and up to 55 psi for the 4 gallon pumps.
Campgrounds have water pressure ranging from 40 psi up to over 100 psi. Most modern campers are supposed to be able to handle up to 100 psi, but I hate going over 60.
2014 Kodiak 292TQB Toyhauler
2014 RAM 3500 SRW with 6.7L Cummins Turbo Diesel