Proper Spot for Water Pressure Regulator

I have seen the geyser effect of a hose blowing while the occupant was out. I have also stayed at plenty of CG's, including the state parks we use every year that have very high pressure. Some even post signs to a.bout it and tell you to use a reg.
I have never seen an RV with a built in regulator. Maybe some high end? Certainly not the norm.
Anyone who even remotely suggests you'll never need one just hasn't been around.