I towed my 3400RL with my 2500HD from 2004 - 2009 without issue. The only thing you can do is look at the weight ratings and make a decision as to what you are comfortable with. The Duramax will handle any Montana you put behind it, the question really comes down to the kingpin weight on the truck. I've since traded the Chevy 2500HD in and have moved to the 1 ton for the simple reason of I know I am going to trade the 3400RL in for something newer and heavier.
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