Those seem to be standard PEX fittings and the clamps look to be high quality. My only concern would be that the insert inside the PEX is plastic, and I might prefer brass.
No it’s the flex whitish tube with pex connectors that’s the leak issue.
Those look pretty perfect to me. Pex can expand and resist freezing. They look properly connected. I would say that looks better than 99% of the trailers I have seen. Its great to have pex.
Note that while pex is both easy to deal with and resists freezing, everything else doesn’t (water pump, etc) so you still need to properly flush everything.
But pex is awesome and also super easy to work on should you need to add a shutoff (they always skimp on them on rvs), add something, etc.
You want to know about rv plumbing check this guy out : https://youtu.be/vrUNC9sd1pY?si=P8ylIf4SQDLo-_ah
Those are PEX fitting connected to PEX tube (you are good). You don’t want to see PEX fitting on flexible tubing. The material compresses over time and leaks develop.
It looks like that arrangement is OK as far as the PEX side goes. You will find these fittings and hoses in every mobile home built to HUD standards.
I have those PEX crimps. I had them leak on me going into water heater. Replaced them with shark bite joints and haven’t had an issue.
PEX is awesome, but apparently rodents love it.
Source: Are these the bad fittings that people always complain about?
