I need new tires for the front of my 420. Right now I have turf tires on the front of my 300. I use a 4 way 54" blade on it to plow my driveway. If the blade is angled, the front of the 300 easily slides sideways. This coming winter, I plan to use the 420 for plowing duties. I'm thinking ag tires on the front might help grip the snow and prevent the tractor from slipping sideways? Also, I really like the look of ag tires on the front and rear. My concern is this: Are the ag tires on the front going to tear up my lawn when I mow? I mow much slower than most people. Also I can't seem to find any ag tires in 18 X 8.50-8. I see plenty of 18 x 9.50-8 ag tires, but I think they'll be too wide. Thoughts?