Another quick tip for you. It’s hard to fit more than 4 baby back rib racks on a standard sized Weber kettle if they’re laying flat. Sure – a rib rack helps, but not a lot. This idea is cheaper, and it works well. Roll up the racks, use a wooden skewer to hold them in place, make sure there’s room for air (smoke..) between the meat, so don’t roll them too tight. The only downside I can see to this is that it makes glazing harder, but I managed to roll mine back out again for the glazing part.
Quick tip: Roll’em Up!