Detroits and ICE are bad mmmk?
Seriously though, on road, I leave my Junk in 2wd. In the icy conditions things can get a bit hairy, but in snow it works great with front and rear detroits.
Trail use is just fine, they do great at slow speeds I've never had a problem trying to turn on ice or snow. Sometimes the rear tends to push the front on the ice, but a blip of the throttle and the front end will pull you where you want to go. This is kind of opposite from what you normally do. On the road, unless you are driving in 6 inces of snow or more, 2wd and less skinny pedal is your solution.
And just for fun, 4 wheel drive + detroits = crazy fun powerslides around city corners. Just keep your foot in it and you will be fine. If you do let off, your going to be doing some fancy ICE ballet in your rig. Pay no attention to all the folks honking and staring in amazement. They are just jealous. And if one of them yells at you, just give them a look like you have no idea what you are doing. This in turn will cause them to exclaim to thier passenger, "See, here in Washington they can't drive in this ****. That's why everything is closed in 2 inches of snow."
Or, if you are good and going across the flats on RT2 on the big frozen bridge. You wood it and it will kick the rear end out, then let off the gas all together and it will kick the rear end the other way. Then wood it again, letting off at about the 70 degree mark, which will whip the ass end around the other way. Continue until you get the feel for this and you can do 90 degree fishtails down the road. Practicing in parking lots is reccomended before trying said manuvers in traffic.