1. Trim excess fat from the pork loin roast.
2. Pat dry with a paper towel.
3. Cover the front and back of the pork in a solid layer of rub.
4. Preheat the Traeger to 165 degrees F.
5. Place the pork loin on the bottom grill grate, fat side down.
6. Smoke for two hours.
7. Wrap the whole pork roast in aluminum foil, creating a leak-proof packet.
8. Smoke for an additional two hours. Remove from foil.
9. Turn the Traeger up to 325 degrees F.
10. During the last half an hour, baste the whole pork loin with BBQ sauce twice.
11. Remove from the grill to a cutting board, let the pork rest for 10 minutes and cut into 1/2" slices.