Heavy duty variable valve actuation

A valvetrain assembly, comprising:

• a main exhaust rocker arm assembly having a first main exhaust rocker arm and a second main exhaust rocker arm;
• a first latch assembly configured to selectively move between a first position wherein the first and second main exhaust rocker arms are locked for concurrent rotation and a second position wherein one of the first and second main exhaust rocker arms is configured to rotate relative to an other of the first and second main exhaust rocker arms;
• a secondary exhaust rocker arm assembly having a first secondary exhaust rocker arm and a second secondary exhaust rocker arm;
• a second latch assembly configured to selectively move between a first position wherein the first and second secondary exhaust rocker arms are locked for concurrent rotation and a second position wherein one of the first and second secondary exhaust rocker arms is configured to rotate relative to an other of the first and second secondary exhaust rocker arms;
• and
• an actuation assembly configured to selectively move the first and second latch assemblies between the respective first and second positions, the actuation assembly comprising:
• an actuator configured to rotate an exhaust cam rod that includes a first cam and a second cam thereon;
• a main arm configured to rotate based upon movement of the first cam causing the first latch assembly to move from the respective first position to the respective second position;
• and
• a secondary arm configured to rotate based upon movement of the second cam causing the second latch assembly to move from the respective first position to the respective second position.