The valves that control each air bag modulate the air by measure ride height between the axle and the vehicle frame. Air usage for this control varies depending on the road the vehicle is traveling on. On roads that curve sharply and dip repeatedly, more air is used than when traveling on a level Interstate Highway. The air compressor will then cycle more often perhaps every few minutes. When on level highway the compressor should cycle very infrequently unless there is a leak in the system somewhere.
Some motor homes use air pressure to create vacuum to operate the air conditioning system.
These vacuum generators use a small amount of air and make an occasional soft psss sound. If there is a leak in the vacuum system then more than normal amount of air usage will cause more frequent cycling of the air compressor. Air used for the Air Horns is obviously at the control of the driver and even full sounding uses only a small amount of air pressure. Other occasional uses of compressed air for fill tires or using an air tool, use varying amounts of air and sometimes require the engine on the vehicle to be operating to keep the tanks pressurized. It is not advisable to use tools that require large amounts of air.