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Party of 5, low airflow from the bedroom furnace ducts is pretty common, not only in the Montanas but in the other fifthwheels we've owned, as well. I think part of it is a design limitation, as Pete suggests. I don't think the mfrs worry too much about it since heat rises, many people spend their daytime hours downstairs, and many prefer cooler temperatures when sleeping. That doesn't mean it's the way it should be, though.
There's also a possibility there's something wrong in yours. In our first Montana the dealer removed the top of the step going to the upstairs (there are screws hidden in the carpet in the corners of the step's top side). There was a junction box there. He found the hose to the bedroom duct was on the outlet that would naturally receive a lower percentage of the airflow coming into the box and the one going to the water closet was getting the larger share. He just reversed the hoses in that junction box and that did improve things a bit, although not a lot. But that's something you could check into. Or your dealer could.
We keep an electric heater upstairs, also, and prefer to use the CG's electricity rather than our propane when we're not paying extra for electricity. You're definitely not alone with this problem.
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