Great photos to compare the various cargo boxes Ed. The M135 box is least like any of the other truck boxes, including the M211. In the post #2 photo, it looks to me like the forward angled rib of the box (over the rear wheel) matches that of the M135.
I agree with Rob... if that is an M135, it has a big load on it's back.
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1953 M37 CDN
1953 M38A1 CDN
1967 M38A1 CDN2
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