If you want a great upgrade for cheap money, dump the surge brakes and replace them with electric. They are vastly simpler, engage immediately, require little maintenance, and survive dunking much better than the hydraulic drum brakes I had. They also are not a problem when backing up a hill and they operate in reverse, so when you are backing down a ramp and hit the brakes, the trailer brakes stop you too; surge brakes can't do that.
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