Yup, that tcase crossmember is a pain in the butt, as is the stupid low hanging gas tank. But numbers can be deceiving. The ground clearance of the 4runner at those locations may or may not be higher, but the GC at the body panels is definately higher. I don't know about you, but when I see a big rock in the trail I usually put my tire over it, not straddle it. The first thing that rock hits is the sliders, not the IFS brace, the tcase or the gas tank.
Two tire options were available for the 4runner and the majority that I see are the larger 31 inch option. 32's fit without any modifications and 33s fit with a minor tbar crank, a 1in BL, 1.5 inch lift coil springs in the rear and minor trimming.