Along with the repair, I would wonder why they separated. Could the trailer be riding to roughly? Any other evidence of rough ride? Some reported considerations are roadways, heavy duty tow vehicle, heavy duty hitch, out of balance running gear under trailer, high pressure tires, or a combination.
I will post some pictures this weekend. I assume what we had in them was too heavy, and that combined with some rough roads is causing the problem. They don't appear to be wood and they are held together with dowels.
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