In my experience, wider rear tires are counter productive on snow and ice. Great for flotation on soft ground, but narrower tires work better in the snow.
If you already have chains with crosschains at every other link and still need more traction, you need more weight on the drive wheels. I've had Turf tires on the rear, and I've had Ag tires on the rear, I found that it didn't make much difference when you have chains on.
I added a carrier on the rear of my 125 to carry a sprayer tank, but in the winter I put about 200 lbs of iron on it for plowing. It has worked very well.
2 years ago, I added more cross chains so it now has a cross chain every other link. The increase in traction with the extra cross chains was significant.
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