I have a 2007 king ranch 4x4 and want to put the largest Nitto Trail Grappler tire possible without rubbing while using my stock 20in wheels,
If anyone has been down this road , please give me an answer.

 

Welcome to FTE.

in stock configuration:
275/60/20 won't rub
285/55/20 won't rub
305/55/20 might rub
275/65/20 might rub

with a 2" level:
275/65/20 won't rub
305/55/20 shouldn't rub
305/60/20 shouldn't rub

The wider you go on the stock wheels, the more prone you are to rubbing at full lock because you haven't offset the wheels to compensate for the extra width.
What I gave you above is a small sampling...there are MANY more tire sizes out there that won't, might, will rub.

Enjoy!


EDIT:

I looked at the Trail Grappler's tire size chart.

The only tire you can run stock, in a size they offer, without rubbing is:
295/55/20
maybe the 305/55/20

Level needed for the:
295/60/20

 

Awesome, thanks,