I think the main issue would be the lack of flexibility in the PVC pipe and fittings. Years ago (think 1970's) RV coach builders used CPVC which for all practical purposes is the same as PVC for installation and behavior. They drifted away from it as PEX and other flexible tubing became available. Too many complaints of vibration shattering, and for for folks in cooler climes, broken pipes if not well winterized.
On the highway, PEX flexes and never creates stress points which will eventually break.
PEX is readily available along with copper or brass fittings. What I have not seen is plastic PEX fittings. The tool can be had in various degrees of quality and price. Alternatively, Flair-It fittings can be used on PEX. Flair-It is readily available and exquisitely easy to work with. The only tools needed are a utility knife and cheap adjustable wrench or pliers.
PEX bends, making it very desirable in RV's as you snake it through the walls, floors, etc.
I don't see any advantages to PVC in this application.
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