Check out this blog article about a guy who basically travelled the world in his Landcruiser and what he has to say about tyre.
personally i hate split rims. I dont like stipping them done and messing about with tubes. However the 7.50r16 size he refers to is great along with 225/75r16 or 235/85r16 in the tubeless.
Have you seen the state forest / np utes running up the beach with a spray rig on the back AT's and not getting stuck? Says a lot.