GM Trailer Brake Control: Left or Right of steering wheel

Having used Ford/Dodge and GM trucks in service pulling GN trailers I always had my electric or hyd brake controllers mounted on the left side. The right side was always cluttered with gear shifters/exhaust brake controls/ignition switch/air and heat controls/radio controls and coffee/soft drink holders.
I never had any issues with knowing which hand to use during a emergency maneuver.