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I know it's a month plus old, but I'm sure folks still have the question. Short answer is no. I can fit a full rack or one & a half if smoked in a vertical holder. You could fit more if smaller racks of ribs, maybe cut in half. I prefer to smoke them whole. I'm actually thinking about a second rack, just trying to see what's the best way to stack it on the top grill.
Mine were delicious, but make sure they get to the right IT. (The experts are pretty clear about this).I took mine off a few degrees shy, and there was a bit of toughness to the meat.