Yeah, there are some chronicles, covered in dust... its like the Maester's library in Game Of Thrones. But alas its nothing so interesting, its just some nerdy spreadsheets.
I collected info from SVN docs and photos seen in the documents in the Australian War Memorial. Manilla folders. A few dozen of them, some very fat and some very thin. Its mixed in with all sorts of forms lodged for shipping and loading plans etc. Dates are not sorted. Years and months are missing or incomplete, so there are many gaps in the "dbase". I can prove the point about document gaps: some vehicles have photos in SVN but so far there is no note in paperwork I have seen. And keep in mind we are talking about records and forms etc from 50 years ago now.
Also there is ADF dbase [current system] info which is not yet public. Nudge nudge wink wink. Say no more.
Here are two screencaps in the sections pertaining to your Trailers and it shows that nothing seen -by me- has mentioned your trailers.