I check the pressure at the hydrant next to the camper that I will be using for my water supply. Depending upon the pressure ( over 50psi) will dictate if I use the pressure reducer of not. I have one just in case but it really does not get much use. Don't know if I am doing it right, but seems to work for me so far.
Chuck " still in Va "
2012 3065w Windjammer
2012 f250 lariat Crew cab power stroke (of course )