Don't know about your furnace location, but some are located under and/or next to drawers. Remove the drawers to access inside the cabinet area to remove the ducts.
If its a Suburban furnace, remove the clamps on the ducts with a 1/4" nut driver and remove the duct from the flange. Then twist the flange around until it unlocks from the furnace case and remove them. You can then slide the furnace out from outside after you unhook the gas line, cable connector, and screws that hold the unit in the opening (3 of them).
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2016 Newmar Mountain Aire 4553
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