We don't have an amber colored light that's exactly like the # MCL78RB you referenced. The closest I have is the Peterson Mini Identification Trailer Light Bar item # 427800, which measures 16-5/8" long and mounts on 16-1/8" centers. Note that this is also an incandescent light, not LED. view full answer...
For the backup solenoid for your surge brake actuator, I recommend the Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800. This will fit in line with your master cylinder and brake line and give you two wires, one that will ground to your trailer frame and one that will run to the reverse light power function of your trailer connector. I've attached a video to assist. view full answer...