Op here, been camping for a few days and no service. Some good points above. What I’m after is knowing when the towed brake pedal is being depressed and releasing. I know that when I press the MH brake, the toad lights will come on, has 4 diodes installed. Had a mental lapse this last trip and adjusted the brake cable WITHOUT having the arms extended all the way after just hooking up. When we took off the arms extended tighten the brake cable and activated the toad brakes, and drug it 100 feet on gravel driveway before getting out to chec everything again. An indicator would have alerted me to this.