Why are you wanting to mount duals? traction problems? You could maybe fill those big tires with fluid? I am not too sure about mounting the cones to the wheel weights. It might stress the bolts, to hold that much weight out so far. We have the cones on a 4 wheel drive MM, but it has 18-34 tires. I am not sure if the dual hubs are universal (ie, JD, IH, Umverferth compatible). I live in Texas, and have 2 hubs if needed.