CTIS is used to remotely raise or lower your tire pressure to meet the needs of the surface you are on. I will let the guys up North give you the word on on ice tire pressure.
Chains are used up north. They make a set made out of plastic/ nylon/ rubber. Then there is the track system you mount to each wheel,at the tune of 2500 a wheel. I will see if I can find a linc.
i have aired down when stuck in ice and it didn't do $hit to get me unstuck, listen to the guys that said chains...