Hummer 2003 H2 Owner's Manual page 248

The HUMMER H2 has an approach angle of 42 _ (A)
and a departure angle of 37 _ (B).
4-20
Design specifications required a minimum gradeability
of 60% (31 _ ) slope, with the vehicle fully loaded,
on high friction surfaces at 6 mph (9.7 km/h).