2005 Forest River Flagstaff odd electrical problem

I agree about the lack of 12 VDC but other than fuses and battery, what's the common point that these two appliances share that would cause them both to fail at the same time? The voltmeter reports no power is going to the control board outside for the fridge or the gas controller for the GH. Inside the trailer on the switch for the GH is not getting power so you'd think the problem would be between the switch and the fuse panel but with no obvious chewed wires I'm looking for something else.