Well now,that depends on how you want to do it,and how you want it to appear.
Chefs will typically select about 12-14 lb birds,because they cook evenly,and well.
It is diffiult to cook large birds,even in a commercial oven.
I had a Smokette,008,which is the shorter version of the 55.
I used to smoke anything,and always tried to exceed the limits on size and weight.
![Roll Eyes](/static/images/graemlins/icon_rolleyes.gif)
If someone is dumb enough to want to prove it can be done,it can be forced to waller around about 25 lbs +/-.
Don't ask how I know.
![Eeker](/static/images/graemlins/icon_eek.gif)
If you read the Turkey 101,it should guide you that you can section up a large bird.
The backbone,wingtips,etc can go to your stockpot.
The leg qrtrs[dark meat] can go in earlier than the breast,and add the breast later-to pull both at the same time.
If you wish to present whole at the table,you might get a pair of 12 pounders?
Hope this helps a little.