Not mine, I don't live in Brighton, Vic, perhaps the owner will come on here and fess up.
I don't think these had mods for tailgates in service? It seems to sit at the right height (lower than the standard No.5), but it has normal wheel hubs instead of the civvy 1.5 tonne type normally found on the RAAF Ally bodied trailers. Someone in Vic with an interest in trailers should go have a look for us!