Looks like a 6X4
https://www.awm.gov.au/collection/C299221
Description
Townsville, Qld. 1944-05-24. This massive trailer, which has a maximum weight of twelve tons, carries the full equipment for No. 3 Mobile Entertainment Unit RAAF ("The Gremlins"), and is also used as a stage. It has full stage lighting, power amplifier equipment, and a selection of curtain changes. When fully set, it has a depth of seventeen feet and width of twenty five feet. The complete show is ready, if necessary, seventy five minutes after the driver pulls up at the site. The performers double as stage hands. The strength includes one officer and fifteen other ranks (fourteen performers, plus one electrician, plus one driver).