I just put 17" rims on my safari. They were from 07 Yukon XL. 265/70 17. 30" total height with most of the tread gone, but I think I will have a several thousand miles on them before I need new tires. The stance is much better and looks better as the 16s with 235 seemed a but small to me...
BTW, I am having to trim the wheel wells
with the stock wheels and General AT2 235