Mix seasonings and brown sugar together and rub all around roast. Let roast sit at room temperature for 30 minutes.
Brush grate clean and place aluminum foil over base of smoker to help keep it clean. Set smoker to smoke setting. Once the smoker starts to smoke, set temperature to 225°.
Place roast on grate and insert meat probe or meat thermometer. Cook until roast reaches 135 degrees F internally. Let set 10 minutes before slicing.
** Timing is approx 35 min. per pound for rare and 40 minutes per pound for medium cook.