If you have to jack it up on the frame, I would do it close to the spring mount areas on the frame. I don't see why you also coyld not do it under the u-bolts on the axle, but someone else will say to not jack on the axle period. But in my opinion if that causes a problem then you probably need a different axle anyway. Just my opinion.
If I have a load on the trailer I jack on the axles(sides, not center), if no load I will jack just about anywhere handy that is heavy enough to suport the trailer.
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