Depends on what stock rims you're referring too; some came with 16x6 others with 16x7's
Either rim can easily run 245/75, the wider rims can run 265/75's, you don't need a lift with either tire.
I've ran 285/75's in the past, but I ran those on 16x8 aftermarket rims...that's probably too wide a tire for a 7" rim, and definitely too wide for a 6" rim.