After my trailer flooded out last year due to the PO's rubber hose and clamp
repairs, I decided to replumb my trailer.
I researched it and chose CPVC over PEX. My reasons were the cost of the
special crimp tool needed was excessive. Or the use of the compression
fitting Flair It fittings in place of the crimps were also expensive. ie.
$4-5 vs 50 cents for a cpvc fitting.
Also, my local hardware store had all the CPVC supplies. The valves and
fittings are also smaller making it easier to make the manifolds and
connections. You also glue the fittings which I felt would be better in a
vibrating trailer.
So far we only used it 3-4 times since the replumb and all has been just
fine. Nice to not have to worry about it anymore. I used to shut the water
off at the campsite whenever we left the trailer. Now I don't need to worry
about it.
You can see more of my plumbing work here:
http://www.telecom-pros.com/tim/airstream/plumbing.htm
Good luck
-Tim