Thanks for the posts, I was going to have the dealer install a Fan. Fan in the Bunk room, but a hole would have to be cut in the roof, I'm hoping the ducted AC fan will deliver some fresh air to the area. if the main room is cool enough with open windows.
You may have to close all the other vents to get decent air flow to the bunks. A friend was having low air flow to one end of his 5er, we solved it by removing the vent and put a piece of plastic to increase the space between the upper insulation and the ceiling - 'ducted' doesn't always mean there is a tube-like duct that air moves through.