Your tractor is bigger than mine, a CK30hst, and I run chains on all four tires. When it's hard pack or ice, I can tell a difference with front wheel traction depending on if the loader bucket or my front blade is off the ground or in float but I'm always able to steer with the chains. My take is that the front axle is much smaller than the rear and I would rather have the rear axle do more of the work. You could weight the front to much and put to much stress on it. More weight would help you push better but I think there is a balancing act of how much is to much.