Several iterations of Heavy Duty have existed in different G.I. Joe series:
- Heavy Duty (RAH) - the original heavy ordnance expert from the A Real American Hero series.
- Heavy Duty (Sigma 6) - the muscle-bounded macho man from the Sigma 6 series.
- Heavy Duty (Movie) - the heavy weapons specialist appearing in the 2009 film
- Heavy Duty (Renegades) - In Renegades, Heavy Duty is Roadblock's cousin.
However, he shouldn't be confused with:
- Roadblock (IDW) - Heavy Duty is the code name initially used by the character Roadblock and appearing in the comics continuity by IDW Publishing.
- Also Heavy Metal is an entirely different character.