Chains will fit fine on the back, it's the front that is a problem. It's too tight on the inside of the tire for chains.
Look into getting cables, they don't last as long, are easier to take on/off and give a lot more clearance. Just make sure you keep them tight, especially if you put them on the front.
I went to a different tire and wheel so I could fit chains on all four. Haven't had to chain up yet, but I am sure before this winter is over I will be.
I can tell you in Idaho, Oregon, Nevada and Washington chains/studs are required, 4WD doesn't matter if they want to push it, but I've been waived thru many check points just cause I was 4WD.
Fresh snow is typically easy, it's the compact snow and ice/freezing rain you'll want chains/cables.
Generally speaking the back two are all you need chains/cables on, especially for on road purposes.