Pre-heat smoker to 225 °F
(Optional) Remove the rib membrane if desired. To remove the membrane, use a butter knife on the back to loosen the membrane and then grip it with a paper towel to pull off.
Generously season ribs with rub.
Smoke for 4 hours, mopping with vinegar every hour.
At some point while ribs are cooking, mix barbecue sauce and with dill pickle juice to make infused barbecue sauce.
After 4 hours, baste ribs with sauce every 30 minutes until ribs are fully cooked to your liking or until hour 6. (Optional) Cover with foil during the last hour for more tender ribs.
Remove ribs from smoker and place on cutting board, let sit for 5-10 minutes. Cut ribs into single bones and, if using, top with sliced Serrano peppers for garnish. Best served with remaining sauce heated on the side.