In Dark of the Moon we see two major uses of Optimus Prime’s trailer. During the investigation of Chernobyl, the trailer transforms into a round weapons depot that Optimus pulls a sword and shield from.
Then, in the battle for Chicago, Shockwave’s pet, the Digger, dislodges the trailer from Optimus’ truck mode.
“I need that flight tech.”
Using the Wreckers as a diversion he then retrieves his trailer and takes to the skies to battle the Driller head on.
In my version of a perfect world, we would get a toy with a trailer that turns into the weapons depot with a detachable jetpack. However, what we got instead is two toys with two different implementations of the jetpack and one toy that provides a weapons depot and no jetpack. In reverse order we have the apparently Japanese exclusive Mechtech Trailer. Its “Weapons Depot” mode is accomplished by standing the trailer on end and opening the doors (as seen in this image from Seibertron.com)
DotM Ultimate Optimus Prime takes a brand new Optimus Prime figure and adds a trailer that looks virtually identical to the trailer in the movie (amazing how easy that is to do when you’re talking about a giant rectangle on wheels).
The Optimus Prime figure is a deluxe with the same mostly Peterbilt 379 truck we have seen countless times before.
However, that’s where the movie-accurate part stops. The robot mode is designed to specifically integrate with the trailer which gives him a very lean lower body and very large, Popeye-esque forearms.
Also, the trailer doesn’t simply provide a jetpack and has no Weapons Deck mode. Instead the entire trailer forms a full, flight-equipped armor.
When combined, the result is a great big, powered-up Optimus Prime with a very impressive wingspan.
In effect, this is not the movie-accurate flight mode Optimus Prime. For that you’ll have to get the Japanese Jetwing Optimus Prime. What this is, is nothing short of a flight-equipped, movie version of my favourite G1 toy, Powermaster Optimus Prime. For that alone, I think he deserves the title of Ultimate Optimus Prime.