The power to trailer brakes are wired in series and the rear axle is usually the last 2 brake assemblies that get power. That would tell me that you need to verify that you are getting 12vdc to each assembly.
A visual inspection may indicate if there is a wiring problem. Most are easy to see if you can inspect the connections.
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2011- 351RLTS Eagle, MorRyde suspension/pin box,
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