I would not put it any place that I did not want to do again.
Pex tubing (the long runs or piping) worked fine. Airstream used it in my trailer and it was labeled "Vanguard" in 1987. However, the hard version used in elbows, tees, etc. is where the problems always occur. The hard plastic cannot stand up to the compression of the crimping rings over time.
I would not want to put plastic tees, elbows, connections, etc. in any location that I did not want to do again. Plastic under compression is going to fatigue!
I have had one incident with the hard plastic in an elbow. I shudder to thing what a problem it would have been if it were in the belly of the trailer. My problem was under the bathroom sink with a line going to the water heater / bypass valve. Only took 2 days to tear out the bathroom so I could get to it.
A sympathetic plumber in Florida told me what to look for with the hard pex elbows, tees, etc. He was dead on the money.
He smiled and told me he had made a good living over the last twenty years due to pex in park models, trailers, doublewides,etc.
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