The rear rims of my JD also has those square 1/2" holes. I welded up some chain links to 1/2" bolts that I installed in the holes. This gave me anchor points so I could run some stabilizing chain to the side links.I do not run them tight, just enough to offset the chain to clear fenders.....
Two years ago I lucked into some old truck chain and made up some chains for the front but never bothered installing them until now.....WOW, can't believe the difference. Our property is all hills, rock and bush. Normally once it snows I am restricted to the main roads and level trails that I keep cleared. This year I am travelling almost anywhere I wish and skidding out poplar logs and firewood thru a foot of snow. With a chunk of log on the forks I can even haul another four 16' lengths on the trailer...