I run the 32 inch Goodyear MTR and have to say that I would not do it without the rod lift. There is no way to run at an extended mode height without the rod lift. Johnson Rods does have a winter sale for $99 so now is a good time to get ready for summer. If you don't want a lift then I suggest you get a tire size that will perform without the lift such as a 265-60-18. I have a complete tire size chart you can look at that can help you decide what needs a lift and what doesn't.
http://johnsonrods.com