Chevrolet 2004 Silverado 1500 Pickup Owner's Manual page 476

If your vehicle has dual rear wheels and the tread
design for your front tires is the same as your rear tires,
always use one of the correct rotation patterns shown
here when rotating your tires.
5-84
If your 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 your tires. The dual tires are rotated as a pair,
and the inside rear tires became the outside rear tires.
When you install dual wheels, be sure the vent holes in
the inner and outer wheels on each side are lined up.