Barbecued Baby Back Ribs

1. To brine the ribs: Dissolve salt and sugar in 4 quarts cold water in stockpot or large plastic container. Submerge ribs in brine and refrigerate 1 hour until fully seasoned. Remove ribs from brine and thoroughly pat dry with paper towels.
2. While ribs are brining, cover two cups wood chips with water and soak 30 minutes, then drain. Combine spice rub ingredients in small bowl. When ribs are out of brine and dried, rub each side of racks with 1 tablespoon spice rub; refrigerate racks 30 minutes.
3.To barbecue the ribs: Place soaked wood chips in small disposable aluminum pan, (or homemade container as illustrated below); set pan on burner that will remain on. Turn all burners to high, close lid, and heat grill until chips smoke heavily, about 20 minutes. (If chips ignite, extinguish flames with water from squirt bottle.) Scrape grill grate clean with wire brush; turn off burner(s) without wood chips.
4. Arrange ribs on cool side of grill and cover (grill temperature should register about 275 degrees on grill thermometer). Cook for 4 hours, until meat easily pulls away from bone, flipping rib racks, switching their position so that rack that was nearest fire is on outside, and turning racks 180 degrees every 30 minutes. Transfer ribs to cutting board, then cut between bones to separate ribs; serve.