Position a wire rack over a large baking sheet and place the ribs on the rack.
Season the rib racks on both sides using 1 tablespoon of Rib Rub per side. Rub the mixture into the meat and set aside uncovered for at least 20 minutes.
Preheat the oven to 275 degrees.
Wrap each rib rack tightly in aluminum foil and place on a baking sheet. Bake until fork-tender, about 2 hours.
Remove the ribs from the oven, discard the foil and any rendered drippings, and allow the ribs to cool for 15 to 20 minutes.
Adjust the oven setting to broil and position the oven rack on the lowest rung of the oven.
Brush the ribs with a generous coating of the barbecue sauce, about 6 tablespoons of sauce per set of ribs or more to taste. Return ribs to the oven and broil until the ribs are browned and caramelized, about 5 minutes.
Remove from the oven and allow to cool briefly before cutting into individual ribs. Serve with additional barbecue on the side, if desired.