Overload (Armada)

Overload (Ultra Magnus in Japan), a late addition to the Armada series, is a red and black carrier truck capable of carrying Jetfire in his vehicle mode. His robot mode, in which his Mini-Con, Rollout, forms his Headmaster, is a heavily armed robot with more than a passing resemblance to G1 Ultra Magnus (thus the Japanese name). In his alt mode, Rollout forms a truck that pulls Overload. Alternately, Overload can be pulled by Optimus Prime's cab or attached to Optimus's trailer to form a double trailer. Overload can also transform into powerful over-the-shoulder cannons for Optimus Prime's super mode.

From Teletraan I: The Transformers Wiki, a Wikia wiki.