I'm going to look into a different controller. After this weekend, I just can't keep using this one. I noticed this weekend that if I use the manual override lever on the controller, the controller shows 100% output, but the trailer brakes will not lock. This is with an 8000# load on the trailer. I can feel them grab, but it seems they should lock or at a minimum I should feel them grabbing hard. They will lock if the trailer is empty. Does this seem right? I think my axles assemblies are alco?