Hightower was originally meant to appear transforming into a yellow KOBELCO CKE2500 II with a robot mode resembling a theropod-like robot with caterpillar threads for feet & a wrecking ball weapon as a key weapon but was dropped due to finalizations of the film. His supposed vehicle mode was seen forming Devastator's left arm, aided by an unnamed bulldozer. Devastator was then involved in a fight with the Autobot twins Mudflap & Skids as they used Hightower to swing on Devastator & shoot him before falling off. Hightower was soon destroyed after Devastator was killed by an experimental ray gun atop the Giza Pyramid, on Agent Simmons' orders.
Hightower as originally seen in Transformers: Robots in Disguise.
Hightower in the Micromaster toyline
Hightower in the Universe toyline. Ironically, this toy is a redeco of his original incarnation
Hightower in the Classics toyline.
Kre-O Hightower. This version is loosely based on the unused Constructicon in the film series (see below) & ironically bears the color scheme of his original incarnation.
An early version of Revenge of the Fallen Hightower's supposed robot mode, serving as the basis for his Legends class toy.
Hightower's supposed vehicle mode as seen in the film (left): a yellow KOBELCO CKE2500 II crawler crane.
Hightower, alongside Overload, was originally meant to transform into their robot mode in the movie, however this was not used as there was no more space in the movie & his supposed vehicle mode was seen as one of Devastator's parts.
Outside the film series, both Constructicons are Autobots.
The deep reason why Hightower has appeared in later media as a Constructicon replacing Hook is due to Hasbro losing the name rights on the said Constructicon & Hightower was used to serve as a homage to Hook.
Hightower commonly appears in many Constructicon-related toy media of the Transformers toyline serving as the crane component of Devastator.