Perhaps it shutting down on the high thermal limit rather then the thermostat in trailer being satisfied? If you have plugged line (ducting to rooms) then you are not getting sufficient flow to keep heat exchanger cool enough and the high thermal limit would then be activated? Just something to consider.
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2020 GMC 3500 Denali Dually Duramax 6.6
2013 Fuzion 342 ToyHauler (Ours)
2011 Harley Davidson Streetglide custom (Mine)
2012 Harley Davidson TriGlide (Trike) (Hers)
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