Im sure this has been discussed, but i figured it will be easier to just ask instead of searching and reading through tons of posts.
I got a 2017 rubicon with IRS, I ice fish a lot and was wondering if it would be best to get chains for just the rear or for both front and rear? also, for plowing do i go with both sets or just rears?

 

For plowing I never use chains. I just put 2 or 3 sandbags on the rear rack and get great traction. Riding on ice would be a different story. I can't help you there.

 

A quick way to get traction on ice is to use screws, but you have to limit your speed or they come out. Years back they held a winter carnival on the frozen inland lake not far from our home. Ice fishing contests, and just a bunch of people riding around on the frozen lake enjoying the day. Carnival wagons with food lined up just like summer fair. Poker runs and lots of good times. If there was little or no snow on the lake traction was limited so we installed screws into the lugs of out atv tires, just make sure they are short enough to they don't go all the way in and create a leak. They gave good traction on bare ice but speed needs to be kept below 25 mph. At high speeds they fling out and cause safety issues of course. after we were done we just unscrewed the little screws and removed them. A couple dozen screws in each tire was all it took. We bought cheap one in boxes of 100 or 200 for less than 10 bucks, sheet metal screws with hex heads worked best.

 

I'm guessing that's why there is a search function. To search and read all the post FIRST.... and then ask if your question wasn't answered.
Cheers