What do I have to do to put 18.4 X 26 rear tires on a two wheel drive C.I.H. 2188? What is the dish that I need on the rims? What modifications do I need to make so the tires do not hit the return elevator? Do I need to put a stop so that the tires cannot turn as far to the right? What other suggestions can you give me to get through the mud. T.I.A.