I have the same unit, but have not been in the mountains of the West, only the Smokey Mountains. I was pulling a 7 X 16 trailer with two motorcycles in it and did not have the experience you are describing. I would downshift but maintained plenty of power. My former RV was a gasser and did have some real problems with some of the mountain roads.
I wish you luck and will be watching to see if you get some helpful information. We have a trip planned throughout the west in June....
Michael
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'06 Tourmaster
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