Use a 48qt ice chest and this.
http://www.ebay.com/itm/Marine-Metal-Products-Double-Bubbles-Fishing-Aerator-Dual-Air-Pumps-/310391209323#vi-content. I have one set up like this. I took the bracket off the back and screwed the black back to the lid of the ice chest, drilled two holes in the lid for the air hoses to go through. Works great!