Dual Tank Compressor??

[RPBurris]

So i currently have a compressor that isnt worth the space it takes up and is probably about 10 gallons. There are plenty of 20 gallon units out there that put out decent cfms. My question is can you put the tanks in series? I would take the compressor unit off the smaller unit and plumb them together to try and give me more volume. Has anyone done this and does it work?