David,
Only 3-ton Fords I can think of are the British Ford WOT1 6x4 and WOT6 4x4. Could also be those E98T/E91T/E987T/E917T 6x4's?
Are the ones you refer you to included in your list of
Known British Ford S/M Contracts?
To spur the imagination - if anything! - I've included a picture of a 1942 model Ford truck. It's cab survives (only just) in the Libyan Desert. Amazingly, it still sports its roof roundel!
Regards,
Hanno
Picture source:
http://www.fjexpeditions.com - make sure you read the interesting story on the The Kufra Convoys