I did something similar a month ago. Visited my local Restaurant Depot and picked up a 40# case of whole chickens. A deal at about $1.60 a pound.
Unknown bonus was there were 16 tender young chickens at about 2.25 lbs each. Smaller than I expected. However, I spatchcocked 6 at a time, 3 per rack, smoked at 275-300 for no more than 1.5 hours, rotated top to bottom half way thru. Pulled at 150 degrees. Split in half and vacuum sealed. Ends up they are the perfect size to split half a bird with my wife for dinner. Plus, pulling at 150 leaves a little room for a reheat in the toaster oven without drying out the meat. In hindsight, I could've smoked 12 at one time, but then I would have missed another chance to fire up the Yoder. I know I burned a few more pellets smoking the next 6, but then I would have had to find a different reason to sit around and drink a beer.