So let's think about this for a minute; the air is not hot enough. You said the air flow seems adequate which eliminates the need of air from a return air vent, sort of. The plenum has been checked with no openings, loose hoses etc. so the "heated" air from the furnace is being routed properly to the vents. The air coming out isn't hot...or warm enough. Is the furnace operating properly? Have you checked the model to make sure it is in fact one sized for the trailer? Silly I know but starting at the bottom.
After that as was suggested measure the temps at the vents. I assume they won't be too warm based on your issues. If not, and the furnace is correct, "and operating properly", the only thing as I think you are leaning to is that it's constantly pulling in cold air vs warmer cabin air to heat. The problem I have with that is that I block my stair vents (about 80%) to keep the cold from underneath coming into the trailer and my furnace will literally run me out of the trailer in 20-30 degree temps. I'm still wondering about sizing (which I would never have doubted in years past), efficiency etc.
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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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