We use an adjustable regulator. Had a Valterra one that developed problems with flow, forgot it at a park in Wyoming, so no loss. Bought a better Watts regulator at a hardware/plumbing supply store, along with fittings to connect to hose ends. It regulates the pressure much better and with the larger adjustable regulators, you get the better water flow, which is the downside to the cheap fixed regulators for RVs. I went with a LFN45B model with 3/4" threaded ends that I could thread the hose fittings onto. Works great.
http://www.watts.com/pages/_products...s.asp?pid=6807