Two kegs and a CO2 tank. I have a T on the regulator so I can carb the second while the first is on the tap.
They are Ball Lock kegs (Pepsi) and the CO2 is a 5# tank that sits on the hump. There are other posts about the fridge. It is the Danby DAR440BL. You need to remove the can holder on the inside of the door to make it work, but that was just removing a few screws.
I bought the fridge from amazon. It was about $170 at the time, but I had a bunch of gift cards which is why I decided to do this.
I also bought the single tap setup on amazon thru a reseller for $137. And an extra gas line and some clamps. So if I didn't have the gift cards, it would be about $320 plus kegs.