Electric Trailer Brakes and Gain Caused Wear

Take a look at the wiring on the axles. I think you will notice how small the wires are that goes to the backing plate and from one side of the axle backing plate to the other one. I went a rewired the axles with #12 wire. Then I saudered the connection at the two wires at the backing plate before I put the twist nut on. Talk about a increase in breaking. I use to have to set mine when I was on the highway and then again in town. Now it is on one setting all the time. By using a bigger wire you are cutting down on the resistance and you increase the current flow to the magnets. This would be the next thing to look at.
While the factory axle wire runs through the axle from one side to the other . I bought a plastic tube used to house wires and mounted it on the outside of the axle tube. Tied it to the axle tube with cable ties.