If you have an insect screen on the trailer I would take it off if you are using the unit. I did that and it caused exactly what you are experiencing. It looked like there is no way it could cause an issue but.....problem solved the minute I took it off. Also, IIRC the manual says there should be nothing to restrict the exhaust or this happens....and mine did it.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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