[Jesse]

Thanks Tom/ Forest, we are crossing the Canadian border today and will try to run the furnace only on electric to see if its the burner around Calgery tonight but I have a feeling its the plenum feeding the living room. We have 4 Rooftop Airs on ours so the location for the plenum seems to be directly behind the stairs, strange location considering the extra space. I'll try to take a couple of pictures to confirm that the rumbling box is indeed housing the plenum.

Jesse White Coach #582