Old thread but man this takes me back to 6 or so years ago when ole Greybrick (changed his userid to Grey) made some posts and lost his sh!t over snow chains when I called him out and he ended up banned. Good times.
I personally bought two sets, 4 chains total. Whenever I encounter roads crappy enough to require chains (other than Highway Patrol mandating their use even if you had snow rated tires) I needed them on all four corners or else steering and stopping were terrible. But you're talking hard-pack snow and ice.