Alright, here is a stumper, purchased in Italy in the last 1980s (88 or 89). It's "Made in Taiwan" and is called "Battle Convoy".
At the time I thought it was a reasonable stand in for Optimus Prime.
So, I'm sure we can all agree right now that it's awesome, but besides being awesome, what is it? [Don't answer "Battle Convoy".]
Yes, the trailer has a spring loaded launcher, and the yellow and red wheeled figures have those little red and yellow "keys" which when you press down "launch" the figure.
The figures fold for easy storage in Optimus' trailer.