If the duct run is long from the heater to the bedroom, you will get very little heated airflow to the bedroom. That was the issue I had.
To resolve it, I dropped the comoplast under the trailer and shortened the duct hose and made sure the duct hose was no longer pinched in a couple of spots. I then added duct dampers at the heater to allow me to balance the heated air flow to the various duct hoses. Otherwise all the hot air comes out the closest heat register which was the opposite side of the TT from the bedroom.
Here is what the heater looks like after adding the adjustable dampers and a heater duct to the bathroom:
http://www.keystoneforums.com/forums...pictureid=3637