The rust behind my reefer was caused (during it's previous ownership) by
a broken city water connector.  It soaked the fiberglass behind the
kitchen unit and kept it wet every time the city water was hooked up.

I found out it was broken the hard way.  Yep ... I soaked it too ... the
first time I tried it.  I now know to check that "Feature" with the
connector pulled out from the van.

Mike C.