Our 2010 Elkmont had similar problems.
For return flow I put in a big household return vent.
For out flow they were only using one of the 4" dia round side ports. I cut a much larger front vent directly into the living area and used the 4" side port only for the bathroom.
I also replaced the accordion flex hose with Al dryer exhaust tubing to the bath.
The furnace was also not screwed down.
Elkmont owners can find more details in the Elkmont section of the board.
Hope they've improved their furnace installation with the reorganization, it really needs it!
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