To simplify my answer above: the belt/frame design of the SO allows for the belt to remain in place under loads greater than 50 lbs and then walking. Conversely, I am unable to get a frame whose stays are anchored behind the lumbar pad to keep from sliding. All belts slide once the weight reaches a certain level. SO’s design allows me (curved low back with a big hind end) to maintain the place I put the belt for a longer range of weight.
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