Add the salt, garlic powder, onion powder, paprika, pepper, chili powder, and cumin to a small bowl. Whisk together to evenly combine. Rub the seasoning blend evenly out over all sides of the roast.
2 tsp salt, 1 1/2 tsp garlic powder, 1 1/2 tsp onion powder, 1 1/2 tsp smoked paprika, 1 tsp pepper, 1/2 tsp chili powder, 1/2 tsp ground cumin, 3 1/2 lb chuck roast
Transfer the prepared roast directly to the rack of a preheated smoker and smoke for 2 hours at 225°.
Carefully transfer the hot roast to a disposable 9x13" baking pan.
Sprinkle both packets of seasoning evenly out overtop. Add the butter pats and peppers directly on top of the meat. Pour the water into the pan.
1 1 oz pkt au jus gravy mix, 1 1 oz pkt ranch dressing mix, 1/2 cup butter, 8-10 pepperoncini peppers, 1/3 cup water
Cover the pan with aluminum foil to seal, then carefully return it to the smoker, and continue cooking for 2 - 2 1/2 more hours.
Slice, or shred, and serve warm.