Payload is a rare one unit only Constructicon. During Operation:Firestorm, he formed one of Devastator's feet, but only to give him a bigger foot to crush with. Along with Overload and Second Bulldozer, he was persumed dead when Devastator was destroyed, but they really survived, and a couple of years later, they were found by two other constructicons, and re-absorbed into the Constructicons
Appearences:
ROTF,the movie