Chevrolet 2003 Silverado Owner's Manual page 452

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.
5-72
When you install dual wheels, be sure the vent holes in
the inner and outer wheels on each side are lined up.
After the tires have been rotated, adjust the front and
rear inflation pressures as shown on the
Certification/Tire label. Make certain that all wheel nuts
are properly tightened. See "Wheel Nut Torque"
under Capacities and Specifications on page 5-118 .
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.