I thought I would share my experience with you. I did 4 trays of wings once, and I'll never do it again. That's going to be about 11-12 pounds of wings. It was a struggle to get the BS to 190 F. To complicate matters, because of the moisture build up, liquid was coming out of the bottom of the door. I had to open the vent wider, from 1/4 to 1/2 open. This caused more problems with keeping the temperature up. When all was done, most of the seasoning in the cabinet peeled off, but the wings were good.
Now I will only do no more then 5 pounds of wings at a time, and fill the other two trays with ABT's, brisket, butt or just do the wings alone.