My CC has both hydraulic and air leveling. In the automatic leveling mode (hydraulic or air) the system dumps air first to achieve the lowest level point before leveling from there via mechanical or air. This is an HWH feature not specific to CC. I would think all HWH systems would have this feature as long as they also have an auto leveling feature.
1990 Country Coach Concept 36' Antares
2006 Jeep Wrangler X, Blue Ox Towbar