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Steve, absolutely no problem with the front axle pivot on your JD. You could hang the darned thing from the front axle and not have a worry. 650 lbs? That's nothing. The weak points are, as mentioned above: possible chafing where the straps attach to the cast axle,(easily addressed with pads) and your 4x4 distributing the weight over the base of four trusses. I would think about sistering those trusses or perhaps full gussets at the load point.
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Best
Les
My train of thought has been replaced by a bumper car.
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