MM,
WM LT40 SHD, 42 hp Kubota, 19" band wheels, B57 belts, only run 0.055" x 1.25" WM blades, 4 deg and 10 deg. Only issue I have had with the 0.055" blades, when I resharpened them myself, I had to go around 2 or 3 times to get deep enough in the gullet to prevent blade breaks.
-w-