[ShrimpBurrito]

This is why I don't even think so much about what parts to replace with the brakes. I just replace all of them (the cost of new brake kits with braking pads is really not much more than any of the parts), and be done with it. It's probably the most important part of the trailer, and costs comparatively little to assure a safe ride. So if I see that either the shoes OR magnets need replacing, I get new kits (with backing plates) and new drums for both wheels. Done.

I also knock out the Chinese-made Dexter bearings that come with the drums, throw them out, and replace them with USA-made Timken bearings (at least they were USA-made when I last bought them).

The magnet surface of the drum can get quite worn, and years ago I was not able to find anywhere able to machine them.

Dave