Since the water pressure was fine without the regulator, I don't think the problem comes from any other area. No sense in tearing into things without ruling out the regulator first.I will purchase a adjustable one and see if it helps. I read where some of the newer RV's have plumbing that can handle 100 psi, now I don't know how true that is, but I wouldn't want to be the Guinea pig. So assuming the newer ones have higher psi ratings 60 - 65 psi seems a good place to start?
Off to Home Depot today to see if they can get me going.