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Congratulations on your new trailer.
There are a couple of places uo front on your old trailer frame which look iffy at best.
The closed axle tube may have no rust or may break tomorrow.
Had one like it break on a private ramp with no witnesses and it was still a surprise and a pain. $300 for new axle and Two 20 mile trips to get it. Do not know what it would have cost on the road.
Given all your time and travel to get this old one fixed, the new one is a great way to go.

I often forget the resale dollars. Even a few dollars for the old one makes the difference.