Scott - it depends on whether you intend to pull the lawn roller as you mow, or if you are just going to use the zero turn mower to pull your lawn roller around your property. If you are going to pull the lawn roller behind you as you mow, I would suggest the 36" wide lawn roller. Since this mower has a 42" mower deck, you would not want to use a lawn roller that is wider than your cutting swath. You would be rolling and compressing grass that you haven't cut yet, which would give you a very uneven overall cut. If you are not going to be mowing while you use your lawn roller, the 48" wide lawn roller would be your option.