Hummer 2004 H2 - Manual (Page 376)

(F) Uniform Tire Quality Grading (UTQG): Tire
manufacturers are required to grade tires based on
three performance factors: treadwear, traction and
temperature resistance. For more information, see
Uniform Tire Quality Grading on page 5-72.
(G) Maximum Cold Inflation Load Limit: Maximum
load that can be carried and the maximum pressure
needed to support that load. For information on
recommended tire pressure see Inflation - Tire Pressure
on page 5-68 and Loading Your Vehicle on page 4-67.
LT-Metric Tire
5-62