05 Z71 with 08 20" LTZ Wheels

[fxst]

As the title says, got an '05 Z71 with LTZ 20s and 275-55-20 tires. Time for new tires soon, would like to go 315-50 or thereabouts. What can I fit with using a leveling kit only? I drive a lot of miles, and do not want to destroy the ride or handling.
Thanks!

 

[Donut Slayer]

Just a leveling kit, you'll be able to fit 33's fine. You could go slightly bigger but your gonna need to trim some of the plastic inner liner. Mainly on the driver side by the windshield washer bottle. I've got 35-12.5-17's on my 04 Hoe but it required lots of trimming with a level kit and 1.5" spacers in the rear. But I also have 1" wheel spacers so the tires will be flush with the fender flares on the Z71 package. Whats gonna get you is the width of the tire more than the height.