hey guys, I've looked around for an answer for a while and haven't came across anything with the answer I am looking for. So I have a 08' Silverado Z71 4wd. It will have a 2" leveling kit on it. I am looking to get some 18" 8.5"-9". I think I'm going to put cooper zeon LTZ 285/60. So my real question is what kind of backspacing am I going to need. I'm new to aftermarket wheels so just trying to figure out what I need. If someone could help me out or point me in the right direction it would be greatly appreciated. Thanks