We have a '95 2wd diesel dually with a sure-grip rear. Only ever had it stuck in the snow...with a trailer on it. I keep winter tires on it. I don't drive it that much.

Bought an '04 dually 4x4 diesel a few years back. Love it. 3.73 gears. Pulls great. I don't care how big the trailer is behind it, it gets 11 - 12 mpg at 70 mph.