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I have rebuilt 2 trailers including axles and all cross members, and in one case even replaced the main beam that the tongue attaches to.

I say this to indicate that I am not opposed to the concept of repairing one. In the case of your trailer, I bet when you start the disassembly you will end up finding the springs and shackles are also bad, and possibly the axle and hubs.

Also those wheels that look fine may be shot. I was putting air in a tire when the back side of the wheel split completely out. Visually both wheels [galvanized spoke type] looked fine. My boats are either on a lift or in one case on the trailer next door to the ramp I use.

If I trailered as much as you I would buy a new one. Especially if you plan to do so in 3 years anyway.

I like Eastern Marine, but check out Champion Trailers for parts also. Think they are in Louisiana.