Typically it means there is a wire run to the roof area for the connections. On my Concord there is a plate on the roof, the wiring is under that plate for the King Dome. IIRC on the Concord you could order the King Dome from the factory, it was on the options list. If you look just to the left side (left in the picture) of the vent closest to the ladder you will see a small plate that has been caulked in place. That is where the connections on my unit are for the King Dome.
As far as the Leprechaun is concerned I would look at the roof of a similar unit and see if the mounting plate is there.