Parked outside Hasbro's showroom for the 2011 Toy Fair in NYC is a disguised Optimus Prime as seen in the current series of Transformers movies. I presume this is one of the actual filmed vehicles, including the joined trailer.
The great thing about Transformers (especially G1) is the reference to real world objects that we see every day, from autos to aircraft. We get a sense of how large the robot warriors potentially are.
Well, maybe not Megatron as a Walther pistol...