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If your butcher hasn't done so already, remove the silverskin on the back of the ribs, as it will impede the absorption of spices and smoke.
Sprinkle the ribs on all sides with the rub.
When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes). Increase the temperature to 250F and preheat, lid closed, for 10 to 15 minutes.
Arrange the racks of spareribs on the grill grate, bone-side down. Cook for 3 to 4 hours.
After the first hour, spray the ribs with the apple juice. Spray every hour after that with apple juice.
After cooking for the 3-4 hours, brush the ribs on all sides with the barbecue sauce.
Return to the grill for 30 minutes to an hour to "tighten" the sauce. To serve, cut each slab in half or into individual ribs. Offer additional barbecue sauce on the side. Enjoy!