Interesting design choice, splitting the trailer across the middle like that. Presumably so the inertia of the transformation wouldn't make it faceplant or toss itself across the room. And... while it's hella expensive, I can't help but admire that they included so many play patterns - Roller as a controllable RC unit, the trailer being able to deploy the artillery platform while the truck is rolling, Roller being able to pull the trailer, the trailer being able to auto-assume the upright repair station mode even though I don't think it's ever appeared in animated form (...?) That's a lot of work.