That's because he's technically not a Transformer. Back then the Gobots property wasn't part of the Transformers Brand.
In America it was owned by Tonka, and it was based off of a line of transforming Robots from Popy, a then subsidiary of Bandai.
It wasn't until 1991 that Hasbro bought out Tonka and all its intellectual properties including the Gobots.
This guy is Road Ranger, a Gobot Guardian. (Not all red and blue trucks are immediately Prime)
http://www.tfu.info/Gobots/Guardians/Ro ... ranger.htmI actually had him as a kid, and he was my replacement Optimus Prime as I was never able to get an actual Optimus as a kid.
He's got some diecast in the cab, and he is pretty cool.
I... have the power!!!!

"The man with the ship and the big red button holstered onto his belt that calls a giant fire-breathing lizard, is always the cool one."
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