Yes, I am very happy and want to thank you all again for being so helpful. I had previously spent a very long time trying to figure it out and you guys provided the answer very quickly. What a great forum!!
The photos of Tommy's truck confirm what David, Lyn and others have said and I note in passing that the spring is attached to the underside of the cross member.
A small point about Tommy K's truck: It may be ex-NZ but almost certainly is not ex-LRDG, as none are known to have survived the war, except one earlier type in the Imperial War Museum. The truck shown appears to be the "India pattern" type of Chev and may have seen desert service as it has correct sand tyres but it has an un-cut grill and several other features that indicate it is not LRDG. But a great truck anyway!