I have 15 rolling to hilly acres that I mow and I am finding that the speed of mowing is not limited by the tractor or mower but limited by the bouncing and rough ride caused by my rough ground. I am looking at purchasing a front mounted 4x4 dedicated mower Kubota f series or New Holland MC. A dealer loaned me a used NH MC-35 to try and I found that it was bouncing all over the place when I tried to mow fast. The seat was comfortable but really had no suspension other than the basic padding. Would a seat with suspension or a mower with suspension really help? I have been told to stay away from zero turn mowers due the the hilly terrain I have on some of my property. Anyone with experience using a mower that can travel fast and mow over rough ground (not bounce you out of your seat) that can also mow sideways on hills? The older I get, sorer my back gets!