Melt butter in large pot. Add in all remaining ingredients and mix.
Once cool, put in plastic bag with meat. Let marinate in refrigerator for at least 16 to 24 hours (the longer, the better).
Set smoker to 225˚F. Add wood chips to slow smoker attachment or wood chip tray. Turn on.
Sprinkle some more BBQ seasoning to taste on meat and load into smoker.
After a few minutes, lower smoker temperature to 180˚F and smoke for 3-4 hours.
Rearrange and pull any done pieces from smoker (usually switch meat that was on right side to left side).
Smoke for another 3-4 hours or until done.