Bring vinegar to a boil in large stock pot. Add sugars, salt and mustard; mix to dissolve sugars. Reserve. Combine remaining ingredients except ribs in a 12-gal non-corrosive container. Add vinegar mixture; cool. Stir mixture; add ribs. Cover and refrigerate up to 24 hours.

 

Remove ribs from marinade; discard marinade. Press Barbecue Rub onto both sides of ribs. Place ribs on racks in shallow roasting pans; add 1/2 inch water to each pan. Cover with foil; roast in 325 degree F oven 1-1/2 hours or until tender. Cut ribs into 1-rib portions. Cover ribs; keep warm or refrigerate until ready to use.

 

For each serving: Grill 2 rib portions 3 minutes, turning occasionally. Brush 2 Tbsp barbecue sauce on each rib; continue to grill 3 to 4 minutes or until heated through and glazed. Plate; serve immediately.