Add the the brown sugar, sea salt, garlic powder, smoked paprika, onion powder and pepper to a small bowl, and stir to combine
Remove membrane from back of ribs, and rub seasoning mix over ribs
Preheat smoker to 225℉ and add wood chips
Place seasoned ribs in smoker, bone sides down, insert temperature probe, (if using) and cook for 3 hours
Remove ribs, wrap in aluminum foil, place back in smoker, and smoke for another 2 hours
Remove ribs, unwrap from foil, and brush with BBQ sauce
Place ribs back in smoker, and cook for 1 more hour
Allow to rest for 5-10 minutes before serving