I'm probably going to get the 2.5" spacers for my bday at the end of the month then shortly after get new tires. Which tire size would fit best without rubbing or maybe very minor rubbing.

Nitto Dune Grappler
LT285/55R20 E 122R202-71016.0 SIZE32.36 W11.77
*285/50R20 116T202-75014.0 SIZE31.30 W11.61

One messures 32.36" overall and the other 31.30 with the widths both around 11.5".

Stock tire size on the X-SP is a 295/45/20 with is 30.45" overall with a 11.6 width.