Max tire size with -12mm offset 20x9 rims and 2 Inch leveling kit

[Armynational]

Trying to figure out the max tire size I get on these rims without rubbing. I'm currently running the stock size tires on these rims (275/60R20) 2011 1500 4x4. Rims are 20x9 with -12mm offset. Also the vehicle has a 2" front leveling kit. Any help would be greatly appreciated.

 

[Graygoose]

I ran a 285/65/20 on a 20x9 with 0 offset no issues.