For the most part, your TT is not big enough to need ducting. I have a Kodiak Cub. The furnace is setup similar to yours. It is noisy when running, but heats fine.
You won't be camping with wet plumbing during freezing weather so the 2 inch duct to the floor is there just for show. The hole through the floor was not drilled through in mine. The covered belly space is not sealed or insulated.
Check your generic manual for your TT. It will say you must winterize the plumbing when ever the temp is 32 deg or less. Frozen plumbing is not a valid warranty claim.
I wish you good luck and happy trails ahead!
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