I imagine the report would come from the coroner with input from the Safety agency but not sure. If so that would be made public.all valid points but reading the story, it sounds like it was an act of one's own folly to be standing on the trailer and had nothing to do with work. I only base that on the word larrikan and "lively".
The employer appears to be the Royal Agricultural Society Queensland (http://www.thechronicle.com.au/news/teenager-dies-after-fall-toowoomba-showgrounds/3001129/). Can anyone comment on their workplace safety record?
regardless of this event; all workers paid or otherwise deserve respect and a safe environment.
Lastly, do you know if Workplace Health and Safety Queensland disclose a report of their findings publicly? I assume they do.