Unfortunately, MSR does not make a shoe larger that a 30 in. However the 30in shoe is is rated for 180 - 300 lbs. If you were to add the float tail in deep snow it would increase the float and would most likely never break. I would only be a little concerned about breaking on packed snow with a heavy load on top of your weight. I would only consider the float tails if you are planning on using these in soft deep snow.