Assuming you have the 30.5l32's on there now, the front of the machine will set 1.7" lower with the 68-50-32 when loaded. This is not enough difference to worry about, and lots of guys like to run with the nose down anyway. We had our machine much more unlevel than that and never noticed much of a difference performance wise. However, with a flex head you may be able to cut a little closer to the ground.