A/C compressor to power air-bag susp?

A friend who is an off-roader showed me a setup that is used to fill onboard airtanks that are used for airtools and flat tires. They basicly use an A/C compressor mounted traditionally on the engine that draws air off of the PCV valve (for lubrication i assume) and outputs air to a 5gal aux air tank. He had the clutch manually controlled by a toggle switch. (a pressure switch on the air tank would be my choice for compressor clutch control) anyone else ever seen this used before? I think it would be a great idea for an air-bag suspension. Any input?

 

Yup, been done, even mentioned in another thread this week.

 

here you go.

http://www.jalopyjournal.com/forum/showthread.php?t=354112