GMC 2005 Savana - Manual (Page 299)

If your vehicle has single rear wheels, always use the
correct rotation pattern shown here when rotating
your vehicle’s tires. Do not include the spare tire in the
tire rotation. If your vehicle has dual rear wheels, always use one of
the correct rotation patterns shown here when rotating
your tires.
When you install dual wheels, be sure that vent holes in
the inner and outer wheels on each side are lined up.
Single Rear Wheels Dual Rear Wheels
5-61