Quit playing around with the Camping World junk and get a Watts regulator. Go to
http://www.rvwaterfilterstore.com/Pr...Regulators.htm
(or come to Quartzsite where they are regular attendees at the RV show) and look for the
"Watts Adjustable 263A Regulator, 2" diameter 0-160 gauge, 4-4.5 gpm".
I have it set at 60 PSI even if the park pressure is less. These rigs are tested at much higher pressure so 60 is a nice compromise. The difference between 40 and 60 PSI with a full flow regulator is very noticeable in the shower.