AA Searchlight trailer- WW2 pics wanted

[Darrin Wright]

Today I found a "AA Searchlight Trailer LP" made by Ritonie Brothers of Auburn NSW. Can not make out th eserial numbers; however, the ARN is still painted on the back- 1226821. The trailer has a steerable front I beam axle, which has linkages from the drawbar, Tyres are a 6 stud, 9.00 x 18" assembly.
Had a look in my DMV book of Aust equipment but there is no pic or mention of this type of trailer.
Does anyone have a wartime pic of these trailers and what would have been carried in them?
Thanks