28" Tire to rocker clearance - Duster

With 26" rear tires I have just under 1.5" of clearance between the front of the tire and the wheel opening at the rocker. If I go to a 28" tire, that will leave a scant 1/4" to 3/8" clearance without moving the rear end back - unless I'm missing something.

What kind of clearance do you guys have with 28" tires in that area?