Not trainers but more likely used as spotters for forest fires etc plus they would probaly carry small quantities of water to spray any small fires.
I saw these in Kefalonia a year or two ago-which I think are PZL (something or another!) which I would imagine have now replaced the Ag Cats for the same purpose. They were constantly flying around the hills and coastline
and occasionaly joined by a Canadair CL215-which made me assume they were fire spotters.
