I asked chatGPT what Mack used to bang on the trailer at the beginning of the original Cars movie to alert Lightning McQueen that the other racers were heading to the start line. It came up with some stuff about a crane arm to which I replied, that wasn't shown in any shot in any of the Cars movies. It then said it was wing mirrors to which I said they aren't long enough. After a bit of conversation ChatGPT apologised to me and said it didn't know.
I haven't tried with any other models but if someone else wants to try I'd be interested in the results.
I haven't tried with any other models but if someone else wants to try I'd be interested in the results.