Bulkhead

"After a long road trip, it feels good to get out of the car, stretch my legs, and kick some tailpipe!"

- Bulkhead in "Convoy".

Bulkhead is the strongest, sturdiest and bulkiest member of the Autobots. During the Great War, Bulkhead was formerly a Wrecker and became great friends with Wheeljack. Despite his loyalty to the group, Bulkhead left the Wreckers early on to accompany Optimus Prime and other Autobots on Earth.