Chevrolet 2005 SSR Pickup Owner's Manual page 241

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 4-29. 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
optional trailering hitch. To order this hitch, see
your dealer.
A. Centering Device
B. Handwheel
C. Lock
D. Ball Rod
E. Ball (purchased
separately)
F. Chain Loop
4-39