Transformers Prime Grimlock

Had this idea floating around. It seems like the only practical way we'd get a modern-day Grimlock is if he had a vehicle mode (because, y'know, a "Giant Space T-Rex" isn't exactly a robot in disguise). But we still need a Dino mode, so why not make him a triple changer?
I decided to go with a Semi Truck. Why? Because Prime is a Truck and he's the leader. Grimlock wants to be the leader, so logically (in his tiny Dino mind), he should be a truck too.
I hear Grimlock is going to appear in Prime, so that's cool.