Appropriate Wheel Offset for 18" Wheels?

I also dont see how you think a 15mm offset will have any chance of fitting in the rear without getting SS/AA on your quarter panels. 25mm MAYBE, 15? No f-ing way. I ran a 10 wide with a 43mm offset and had about an inch of outer clearance WITH bulged and rolled lips. That was with a stock A-body rear with drum brakes, your rear is even wider???