Add oil, brown sugar and spice rub to the aluminum try. Use a fork to combine.
Press each side of Pork into the seasoning mixture to evenly coat the roast.
Break apart the garlic head into individual cloves. Place around the aluminum tray. Cover tray securely to aluminum foil and place on smoker for 10 hours.
Start checking for doneness around 8.5 hours. When pork falls apart with very little effort, it is done.
Remove garlic cloves from skins and mix into pork as you shred it.