GMC Safari 2003 Owner's Manual page 204

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 centerline.
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.
{
CAUTION:
Do not load your vehicle any heavier than the
GVWR, or either the maximum front or rear
GAWR. If you do, parts on your vehicle can
break, and it can change the way your vehicle
handles. These could cause you to lose
control and crash. Also, overloading can
shorten the life of your vehicle.
Using heavier suspension components to get added
durability might not change your weight ratings. Ask your
dealer to help you load your vehicle the right way.
4-30
Notice: Your warranty does not cover parts or
components that fail because of overloading.
If you put things inside of your vehicle – like suitcases,
tools, packages, or anything else – they will go as
fast as the vehicle goes. If you have to stop or turn
quickly, or if there is a crash, they'll keep going.
{
CAUTION:
Things you put inside your vehicle can strike
and injure people in a sudden stop or turn, or
in a crash.
•
Put things in the cargo area of your
vehicle. Try to spread the weight evenly.
•
Never stack heavier things, like suitcases,
inside the vehicle so that some of them
are above the tops of the seats.
•
Don't leave an unsecured child restraint in
your vehicle.
•
When you carry something inside the
vehicle, secure it whenever you can.
•
Don't leave a seat folded down unless you
need to.