during the merchandising blitz for the first Transformers movie, Hasbro released some Hot Wheels like toy cars of some of the Transformers in car mode. Here is Optimus Prime as a blue and red tractor trailer truck. The vehicle is pretty much all plastic, not metal like most toy cars of this scale.
If you flip the truck over you can see that Prime's robot mode is sculpted on the bottom. I guess a kid could pretend he transformed. It's kind of lame but oh well. I think I bought this toy at Five Below.