FTC after smoking, then cool, vacuum pack in the largest chunks your bags can handle, and freeze. Thaw and reheat (with the defatted drippings for moisture) slowly to about 140o.
Lots of methods to reheat, among them:
...sous vide,
...still in the bags in some sort of water bath,
..."nekkid" on a rack in a crockpot, or
...in a foil tray covered in a slow oven.
Then pull and serve.