Even though the Transformer robots turned into alien vehicles on their home planet of Cybertron, they are shown having Earth-vehicle parts on their bodies. They were drawn this way on purpose, so that the kids could recognise the characters right away.
Wheel-Jack is the very first Transformer character to appear and speak in the cartoon series. He remains an important character throughout the first two seasons until his off-screen demise in The Transformers: The Movie (1986).
An Autobot in the form of a truck crane, who is referred to as Hauler, appears briefly to haul Hound up for repairs. He appears only in this episode, neither speaks nor transforms into robot mode, and is never seen again after that scene. Many fans assume that Hauler is an early version of the Autobot Grapple.