Buick 2006 Rainier Maintenance Manual page 300

Your vehicle has an electronically controlled air
suspension system that automatically keeps your
vehicle level as you load and unload your vehicle.
See Electronically Controlled Air Suspension System
on page 4-50 for additional information.
Certification/Tire Label
A vehicle specific Certification/Tire label is found
on the rear edge of the driver's door. The label
shows the size of your vehicle's original tires
and the inflation pressures needed to obtain the
gross weight capacity of your vehicle.
4-48
This is called Gross Vehicle Weight Rating (GVWR).
The GVWR includes the weight of the vehicle, all
occupants, fuel, cargo, and trailer tongue weight,
if pulling a trailer.
The Certification/Tire label also tells you the maximum
weights for the front and rear axles, called Gross
Axle Weight Rating (GAWR). To find out the actual loads
on your front and rear axles, you need to go to a
weigh station and weigh your vehicle. Your dealer can
help you with this. Be sure to spread out your load
equally on both sides of the center line.
Never exceed the GVWR for your vehicle, or the GAWR
for either the front or rear axle.
And, if you do have a heavy load, you should spread
it out.
Similar appearing vehicles may have different GVWRs
and capacity weights. Please note your vehicle's
Certification/Tire label or consult your dealer for
additional details.