Welcome Driftwoodgal,
we had a Sportsmen 3051 w/2 slides before the Montana and we really like the Montana a lot better. It has a lot more room and seems to be put together better as well. We had a few issues with our Sportsmen that had to be taken back to the dealer a couple of times. So far only minor things with the Monty. We do not full time in ours so I am not a real big help to how it is staying in it for 6 months at a time. But we do take it on 2-3 vacations at least twice a year. Your Duramax will handle it fine.
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