Jon, your 87 liberty was the same as my Liberty, or a least very close, so you are very familiar to the floor plan. The main electrical panel is approx. 3-4 feet aft of the electrical bay. I mounted the magnum controller in the salon panel and tried fishing wire to the electrical bay..... tough, if not impossible. I clipped the old inverter controller wires and soldered in the new magnum controller.

I think I'm lucky here..... I have the small electric BBQ in the opposite bay. It doesn't fit the size of steak I like anyways... so I won't miss it. It is a single designated appliance 30A with a breaker on the panel. I could wire this to the transfer switch on the inverter so that the inverter will charge the house batteries. Label it - house battery charger.

This should work.......right? I think it is worth the effort.