The truck never, ever moves. Nor it was ever supposed to. Transformers has absolutely zero moving props in the entire attraction. Sure there's fog, lighting, heat, water and sensory effects built in, but no prop mechanics or anything. Just screens.
What you're confused by is the illusion of the truck moving. They achieve this easily: the RV is on a curve which moves subtly to lock in place for it to have the motion base swing around and immediately head downwards on the track. The image coincides with this by changing the angle ever so slightly to match the vehicle movements, with the back half of the truck seen onscreen moving along with it while the prop (front half) is stationary. So it looks like it is moving subtly if you really aren't paying too much attention. I can guarantee that repeat visits will probably destroy the effect for you as you get more used to the ride experience.
Onto Florida: interesting. Looks like their queue may be a little longer than what was rumored.