If your unit looks exactly like the one listed below, you have a built-in regulator and just don't know it. Many different RV's class A to C, use this inlet unit. For about $30.00 you can get this city water inlet with built-in 65 lb. pressure regulator unit at Camping World or here at RV Parts Center: (Many other places too)
My Safari came stock with it and it would be so easy to add to most any RV. It has the standard 1/2" RV threaded fitting on the rear and female hose fitting on the front. The hose threads became cross threaded (big/strong/dumb son in a hurry) so I bought a new one at Camping World. CW doesn't say a thing about theirs being regulated but it is the same one I took off and both had regulators and are identical; I guess that way they can sell you a separate pressure regulator you don't need on top of this unit. I bought mine at CW locally because it was easy and quick. The unit works great!