I run my SC with both tires all the way in with just a slight gap between the hub and axle housing. 12.4"X36" tires with rims dished out. This is with a C20 2-14" fast hitch plow.
My SC has a fresh motor and in my heavy clays it will barely break new ground. Once the ground has been turned it's 1st gear WOT with 3 weights on each side.