Don,
Low range doesn't buy you anything on the hills - it's too low and would probably tear it up with the weight of the Monty on the back. No advantage there.
As far as traction, I think the 2WD with over a ton setting on the rear hitch is probably just as effective as the 4WD on ice or slippery roads. 2WD probably rides better, and probably gets better mileage.
To me - it's what you like to do with the truck when not towing. Our 4WD is great for Colorado weather, launching the boat, or even a nice off-road tour. It's not a Jeep, but it will go quite a few places.
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