I think it's probably good. I agree, that a tube sliding within a larger tube would be much stronger and eliminate the hinge. But, I think the way it is the kayak center-of-gravity (COG) is well in front of that hinge. I think this rear extender is not supporting much weight, and just mainly for balance and some more spreading or distribution of the weight. I like that it folds out of the way. Also, I could see it possible to add a short bar on each arm to span across the hinge to lock it in and further reinforce this weak point.
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