RVs are tested to at least 100 psi. PEX, fittings and fixtures can all withstand min. 100 psi but I'd worry more about a defective valve or a worker at the factory not doing a PEX or other connection correctly somewhere. (Only takes one bad one.)
RVs can safely be run at 60 psi which is what I run our Watts at. If you call RVwaterfilterstore or go to their website, they recommend 60 psi.
If you don't mount the regulator at the CG faucet and have it at the city water inlet or mount it inside, it's a good idea to get a high pressure hose such as the one Valterra makes. CG pressure has been reported getting as high as around 200 psi in some cases.
We are presently at a CG with low pressure, just 20 psi and that's on a good day. I sure wish these regulators could regulate back up to 60...
