A lot of variables in that question. How large of a trailer? Ducted or not? Open floor plan or closed off bedroom area?
The 13.5k unit on my 22BHM is not ducted and does just fine in our little trailer, even in very hot weather. I wouldn't want to have that setup in a much larger unit, but it works just fine in ours.
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2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56
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