Like said ... you can bend an axle by jacking the whole trailer up with the jack say near the middle of the axle, how ever that would increase camber causing the tires to wear on the outside instead of inside. Many of us have jacked up a side of our fivers with a jack placed on the axle under the springs themselves without issue. Once in a while an axle will "go soft" and loose it's positive camber, but it's usually due to overloading or hitting something. I don't think they have "turned" on you as that would be near impossible and could readily be seen by the backing plates way out of position.
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