On topic though, I have noticed that the Caribbean CN consistently doesn't build transports. It's the only CN I have this problem with, as all other regional CNs I've made actually do build transports.
I haven't seen any CN building/using transports. In a recen Spain game, I colonized all of the Americas except for a handful of the Caribbean islands, which were French. In a dozen wars with France, not once did it happen that one of my CNs occupied a French island.