Try this site;
THE WILES COOKER
This is the old Wiles cooker used by the Aussies through WWll and Vietnam. The Junior one is probably the one that would apply to your trailer, but remember that these were basically built to cater for Platoon strength whereas the Senior model was for Company strength and above. They were pretty capable units catering not so much for todays more common BBQ style but moreso for steam and pressure type cooking.
If you are thinking more on the lines of catering for yourself, Mum, and a couple of kids, then either of these would be overkill!
Best of luck. Wouldnt mind sampling some of the finished product one day.
Regards
Glen
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1963 2a gunbuggy 112-722 (Onslow)
1964 2a 88" SWB 113 251 (Daisy)
1965 Mk3 170-937 (Von)
Track Trailer 200-166
2001 TD5 Disco 2 (Hyacinth)
REMLR 226