I have a Thor Chateau 31W, it has the full length slideout on the drivers side, my problem is that the duct work under the sink that goes under floor over to the other side to the bathroom and living ...
My C came with a rear galley and head, the heating duct for the galley was a 3" and the one for the head a 2" so I rerouted the 2" to the galley and the 3" to the head I had to add more 3" duct, in order to have more air flow I installed a spark proof blower for the 3" duct to the head, these are used in boats to vent the engine compartments and installed a switch in the head for the blower motor, at the same time I installed a switch in line with the water pump switch.