I've got 305/50R20 Terra Grapplers ( 12.2" wide x 32.1" tall)
Mounted on Stock 20"x9" Chrome Wheels, no spacers, no rubbing.
2010 Reg Cab Short Box 4x4 that's been Dropped 2/3 (Ground Force).
Front passenger side at full lock left turn has over 1/2" clear from sway bar.
( you can also see about 1/4" clearance from upper A arm to inside sidewall of the 305 wide Grapplers)
upper a arm clearance (no spacers)