I have done HUNDREDS of birds on a 22 inch kettle...up to 25 lbs, somestimes 2 smaller ones at a time.
I use a stainless bowl in the center filled with steaming/moisturizing juice. beer wine water soy sauce, everything goes in...
I use 2 x chimneys of K-blue around the outside of the pan which is in the middle....you do want to cook at around 300 degrees, keep the water at a low boil, about 6 hrs for a 20 pounder...I use hickory, apple, Jack Daniels oak, cherry, whatever chips I want and use them thruout the 1st 2-3 hours. Poke the coals to get rid of the ash frequently and to keep them hot. Sometimes, usually I have to add another chimney about 2/3 way thru. I used to do a small one every sunday for lunch meet during the week. I cook 2 turkeys for the family T-day yearly, 2 more for the local Vintage Volvo club Christmas party (
www.SDVSA.org) and assorted ones thruout the year.
The meat is extremely moist and smoky, no need to brine. anything works for stuffing, coat skin with butter or Evoo.