Lugnuts ???????

Hi everyone,

  I just bought a 2002 Chevy Suburban and had a little question. I was getting ready to rotate the tires and I cannot figure out how to get to the lugnuts. I have rotated many tires in my lifetime and have never seen anything like it. Do the plastic lugnut covers pop off to reveal the lugnuts or do the center hubs come off. I do not see a slot in the back of the hub to pop it off though. Maybe I am just slow mentally today !!! Here is a pic of the wheel.

Thanks, DW