Update - I shortened the hose in the basement to remove most of the "S" bend. It did improve the heat output somewhat to the upper part of the trailer. Not real dramatic though. I'm considering closeable vent covers for the 2 lower heat vents to force more heat up there, but even by blocking them it doesn't seam to punch alot of air up there.
What do you think about blocking off the 2" duct the goes under the house when your not in real cold weather? Do you think that would help?
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