E-bay keys and rear coil spacers, longer rear sway bar links, longer shocks, both front and rear (or spacers if your existing shocks are like new). That's it, end of discussion. You don't need a "kit" from Supreme Suspensions or any other company offering everything, UNLESS their kit is roughly the same price as piecing things together.
As far as tires, it all depends on your wheels. Stock wheels, 285's may rub on the sway bar in the front, or the frame in the rear (of the front wheelwell). If you have offset wheels (or run spacers), you may rub the edge of the bumper, or the rear of the fenderwell - either is an easy fix, with a sawzall and a 5 lb hammer (search for mini NorCal mod on YouTube).
I've had 285/75/16's (on 16x8 wheels, 1 1/4" more offset than stock) on my Yukon XL with nothing other than turning the factory arms, and no rub. I've heard of guys running 305/70/16's, and even 33x12.50's - they undoubtedly scrub a bit, unless they are up over 3" for a crank.
I did run some 315/75/16's on my older Suburban (with 3" front and rear) for about a week, but I did a NorCal mod on that, and I still couldn't turn lock-to-lock, much less during full suspension flex.