Stumpalump
Expedition Leader
Chains off road can grab roots and rocks and break axels. Go easy.
You get the most benefit from chaining the front, but if I can (vehicle dependent) I chain all four.
One of the big problems with only chaining the front tires is that when you're on ice, your vehicle will be much more likely to swap ends when you use the brakes due to great traction in front and nearly zero traction in back. We see this all the time on front-wheel-drive vehicles here in the mountains when CalTrans puts up chain controls.
If you only chain the rear tires, you not only retain safe straight-line braking but you also have the chains on the stronger axles.
I have a set of cables. Are people chaining up 2 or all 4 tires? My use would be for South or North Pass into Saline Valley.