GMC Chevrolet SSR 2003 Owner's Manual page 228

Total Weight on Your Vehicle's Tires
Be sure your vehicle's tires are inflated to the upper limit
for cold tires. You'll find these numbers on the
Certification label at the rear edge of the driver's door.
See Loading Your Vehicle on page 4-31. Then be
sure you don't go over the GVW limit for your vehicle,
including the weight of the trailer tongue.
Hitches
Your vehicle is compatible only with the following
trailering hitch. To order this hitch, see your dealer.
4-42
A. Centering Device
B. Handwheel
C. Lock
D. Ball Rod
E. Ball (purchased
separately)
F. Chain Loop