2009 Chevrolet Express Van Owner's Manual - Page 312

Dual Rear Wheels If the vehicle has dual rear wheels and the tread design for the front tires is the same as the rear tires, always use one of the correct rotation patterns shown here when rotating the tires. If the vehicle has dual rear wheels and the tread design for the front tires is different from the dual rear tires, always use the correct rotation pattern shown here when rotating the tires. The dual tires are rotated as a pair and the inside rear tires become the outside rear tires. When you install dual wheels, be sure that vent holes in the inner and outer wheels on each side are lined up. Also see Dual Tire Operation on page 5-65 for additional information. 5-72