Stock height, 255/50/20. Lifted heughts then 265/50/20 or 285/50/20. You can go here to configure your stock tire size to new tire size.
The most aggresive 20" tires I have seen our there that would fit a small lift on the WK is Nitto Terra Grappler and/or the Toyo Open Country A/T. Mikcey Thompson may make some now, but I have not checked.