If you have the right rear-end you can move the Montana with a big gasser or diesel.
I drive a lot in the mountains of Colorado and the the diesel is all about the "exhaust brake"!
I drive a 2017 Ram 3500 SRW and the the #1 reason to have a diesel is the exhaust brake, period! Safety! If you have disc brakes on your Montana then maybe a gas truck will work great. But with the electric drum brakes - did I mention "exhaust brake"!, Just me option.
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