I have volume 7 of the design branch records here, and in the chassis section it shows the doubling on both the 4 ton and the 5 ton 4 wheel trailer. The photo of the 3 ton trailer is not definitive as it is more of a front 3/4 view. I think the doubling of the frame towards the back is to simply bring the level of that portion of the frame to the same as the front turntable, so that the spring brackets can mount in such a way that the trailer sits level.
I have seen the same doubling on the two 4 wheel trailers that I have at home. Both of them are "impact type" brakes.
Edited to add: I just checked an original copy of "the vehicle data book" and it also shows the doubling of the frame on the 3 ton trailers.
Also, according to the design records, the 2 ton trailers were not on Cdn contract. We stuck to the 3 ton trailer, while the 2 ton (10 ft box) and the 5 ton were done to ministry of supply orders.
Last edited by rob love; 15-02-18 at 20:47.
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