The main issue (that I have spotted) is that for RotR to hit THRC, it has to be running like clockwork. The combo of Holding Cell pre-Show -> Load -> Scene 1 (Prisoner Transfer) Should Run in prefect synchronization, where the holding cell is quickly refilled during load, the vehicles are dispatched and switch during scene one. Meanwhile, all four cell/loads have to be timed to function in a slightly staggered manner to maximize capacity while maintaining show standards. A small cascade due to a backup at unload has the potential to bring the entire ride down with it if they are maximizing capacity on the aforementioned tight schedule.
Speaking of cascades, the RV's are programmed with quite a lot of "stalling" narration to cover. My personal favorite includes R5 "refusing to move" leading the narrator to negotiate for compensation.