Your trailer axles might actually be CMP trailer axles. The CMP trailer axles were typically 2.75" solid square bar stock. The brakes were standard CMP parts (i.e. Ford) and the springs were often described as "as formerly used on Ford 30cwt" trucks. I don't see enough of the trailer frame to be sure, but what I see in your photos looks similar to the frame of the 4 wheel CMP trailer that was made in several capacities between 2 and 5 ton.
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