I have an older Kubota M7970, great tractor. I am the 3rd owner and the fellow I got it from was good mates with a tractor dealer who set it up for him knowing that he would be mowing some pretty steep slopes so the wheels are at max width, I don't know the measurements but the wheels sit outside the guards but cause no problem. my first thought was to turn the wheels and make closer to standard but then I end up on some steep slopes as well and it makes me feel better. Where I find it at its best is doing loader work I have what we call a 4in1 bucket on it that can grab and lift fairly large and long trees to stack on fire piles, I use a heavy counter weight on the back and get pretty good at picking up the trees at the point of balance but having the wide wheel base is a big help as well.
The only negative to it is dragging implements that are a little narrow but that doesn't happen too often, the only one that comes to mind is a very old set of light trailable offset disc harrows I have but if I offset them on the drawbar enough and just keep circling the one way then wheel marks left behind are not an issue.
Ken