I have a front bedroom TT. The duct work that goes to the bedroom is small - maybe 1" it doesn't flow any air to speak of. It's the same size as the duct that terminates under the TT for the "heated" ...
My TT has a manifold which consists of 4x 4" exhausts: living room, kitchen, bathroom and bedroom. When heating, I get equal temps across the TT, no cold spots - great when the kids are sleeping with DW and I. Now when we are camping alone, there is no need to heat the whole TT, just the bedroom - then I use this: Sunbeam convection heater
Small, low-profile (easy to store) and with temperature presets. No noise since there are no fans, and with the door closed, heats the room quickly.
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