First 5th Wheel--Bad Braking???

I had my trailer back at the dealer twice due to braking being jerky at times and sometime barely braking. Both times they said nothing wrong with the camper so it must be in my truck controller. Bringing it home a few months ago and slowly coming down my street, I activated my controller and watched front drivers side lock. Nothing from other three. So that week I jacked it up and pulled the hub, everything looked good. Pulled the rear hub and found the wiring on the magnet chewed up and shorting out. Checked the other side and was good so I replaced the one magnet and all is good. Sent a picture to the cell phone to both the service manager and owner of the dealership, still no acknowledgement.