Just to clarify, cab-over trucks are still being used today in the US, though most new ones are smaller cargo-sized. From time to time, I've seen existing COE trucks used; but mostly for private farm use (as they're not nearly as popular as they once were here, and are getting long in the tooth).

https://www.reddit.com/r/cars/comments/16vmzp/why_are_americ...

They tend to look like this: https://www.google.com/search?tbm=isch&q=mack%20truck

The engine sticks out in front the driver cabin. They also don't have barriers on the side that keep passage cars from getting under and being hit at head height

Exactly like Optimum Prime in truck form.