Curt,
Their is something not right with your 6.0, and the dealer should not have to have your Monty to figure it out. I pull mine with the cruise and tow haul on and have never had a problem, or had to make a run at a hill. If I set the cruise at 65 that is where it stays and only shifts down on a pretty big grade. I have a 3.73 gear which is a harder pull than your 4.30 and our Montys are about the same weight. I hope your dealer can fix your problem for you.
Bill
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