My air locker setup is independent. My solenoid for the rear locker is on the right side of the truck and the one for the front will be on the left side. My setup will allow me to run both or each one independently of the other. You can wire the ARB up to do this, but most shops won't do it, you are on your own. You simply install a tee at the reservoir on the compressor and hook one to one side and one to the other, BAM, problem solved. Your installer won't support it though and neither will ARB. This info is courtesy of a Toyota shop in CO I dealt with in purchasing my braided stainless steel air lines for my locker.