I've done eight chickens on my 18" a couple of times, had to use the lower rack there 
. Usually if I do butts I do four, two on top rack and two on bottom. I've not smoked a lot over the past couple of years but when I do I generally go large and vacuum seal, so probably half the time I use the smoker I use the lower rack.
Rick
	
		
			
		
		
	
				
			Rick
	