You'll be fine with the 10.5 Ags. Everyone has an opinion including me, what works for some might work better for others, or not.

I do most of my plowing at a plow day even where I'm following some sort of furrow left behind by the plowing person in front of me. half the time its not much of a furrow, the other half its to deep.... Sure an 8.5" works better at times but seriously the difference is not that noticeable with our Cub Cadets. If you have 8.5s or 6" Ags in soft ground while plowing you could spin half a tire and be stuck/hung up before you blink whereas a wider tire might get you through a soft area.:BlahBlah::BlahBlah::BlahBlah:

After install your Ags you'll be happy - that's my money back guarantee:beerchug:

The extra inch or 2 width will not make much difference soft ground.

I would be using 10.50 if they work better at plow days. I had more problems with rough ride and breaking pins in the drive shaft on 10.50 tires.

I'm far, far from being a plowing expert. I run 23X8.50-12 Tru-Powers with wheel weights on my 71/121. From the little bit of plowing I've done they seemed to work great. On my grass cutter 2182's I'm running 26X12-12 loaded Tru-Powers also very happy with the results, no more spinning turf's. 1st pic is before I added the wheel weights on the 71/121