.........Yesterday, I had to go out with my LC to recover a friend's Jeep, as he dove on to ice and then almost went over a 200ft drop with all of his family. .......... - I chained up in mud, before we hit the ice and was very glad I did so. That said, most would wait to put the chains on until they started to slip. This is what my friend did and it almost cost them their lives if he had continued to slide. They were very lucky...........
Man, it is always a judgement call. When I recommend holding your chains in reserve, I'm talking about normal wheeling. If you're on an icy road with a 200' dropoff and you have chains, you would be very foolish to not chain up before you went anywhere near said dropoff. I'm sure there are lot's of examples where putting on chains ahead of time kept rigs out of trouble. For most snow running, chaining up ahead of time makes sense and is the way to roll. If you're out goofing off, it makes sense to keep something up your sleeve to help you stay mobile. And it was advice I got from experienced off roaders when I was a rookie.
One thing you need to remember about chaining up only one axle on a 4 x 4 rig in the slick stuff. It is going to perform a lot like a 2WD with power to the axle you chained up. If you only have 1 set for a 4 x 4, put the chains on the front axle for the best traction (slow going) and going uphill. Put them on the rear axle for higher speeds, such as chains required on highways in mountain passes or for going down hill off road..........4. Both vehicles had chains only on the back end, so the front ends tended to slide around coming down off the mountain. With the 100, I do not have room for chains on the front, but given how solid the back was, it would have been nice. That brings up an important point: you tend to have more traction going up than coming down. Keep this in mind when wheeling as the drive down tends to be more dangerous than the drive up.............
Warning: If you try to go down a steep slippery hill with chains only on the front axle, your rear end will try to come around on you and cause you to lose control. Also, if you try to climb a steep slippery hill with chains only on the rear axle, you may not have steering control when you need it.