Browsing the internet and found this.... I think it is also called the Z85 package. Hope it helps.
Hummer H3s are offered with two suspension packages to suit different terrain requirements. The standard Z85 heavy-duty handling and trailering suspension provides more balanced on- and off-road performance, with 32-inch all-terrain tires and different rear-axle gearing. The optional Off-Road Adventure package is designed for more aggressive off-pavement capabilities, with taller 33-inch tires, specially tuned shock absorbers, a cast-iron front differential case, locking front and rear differentials and shorter transfer-case gearing for maximum control during hill climbs and descents. It also adds some of the Luxury package's items, like a power driver seat and the upgraded Monsoon sound system
