Air dampers are of the "spin-damper" type rather than the traditional sliding louver.
This provides individual control of airflow across the left, center and right sides of the firebox. Not shown: Gas log lighter port and other small details. The trailer is a 40" wide x 48" long utility trailer rated 1100 lb GVW and fitted with 12" tires & wheels. Estimated weight of this smoker is under 700 lbs.