I know I'm late to the party, but my guess to Teebin's riddle is VTUs (aka elevators) like Transformers has to transport the RVs to an upper floor. That would let the ride path be flat but also utilize the height of the show building, and would be "unfeelable" with effect to conceal the lift.
Edit
Never mind, just read the Rockit thread. Oh well, it was a decent guess...