Phoenix, the "No5" is the name for the GS box trailer (and follows on from "trailers, 1/2 ton, No1, 2, 3, 3A and 4 (Aust), all General Service cargo box bodies), and was not applied to the Workshop trailer, which was generally known as a "Trailer, 1/2 ton, Platform" (or other specialised variant). I note you have used No5 interchangably between GS and Wksp trailers in the REMLR ARN lists.
