I've had several 5ers with Dexter 12" brakes and heavier wiring and 7k plates made little improvement. I'm getting ready to move so I bought a 34' cargo gneck with 3-6k torflex axles and the brakes are awesome. I pulled the wheels for packing and inspection and I saw these brakes have different magnets than any of the RVs had. They are much larger and they are oval and I think the wires are white. I looked them up on the Dexter site a long time ago but I don't remember the pt. #. I will check into using those magnets if I ever have trouble with 12" drums again, before changing to discs. Craig