Mix ground beef, sausage, onion, cheeses, jalapeño, seasonings, and 1/3 cup barbecue sauce in a large bowl. Combine gently—don’t overmix.
Fill uncooked manicotti from both ends with the meat mixture using a spoon or fingers. Pack gently to avoid cracking.
Wrap each shell fully in bacon, overlapping ends. Use one or two slices per shell. Secure with toothpicks if needed.
Lightly brush each wrapped shell with barbecue sauce.
Preheat smoker to 250°F. Place shells on grates or foil tray. Smoke 60 minutes, flip, baste again, and smoke 60–75 more minutes until bacon is crisp and filling is cooked.
Let rest 5 minutes. Serve hot with extra sauce.