Inverter Chassis Ground on Copper Propane Line?

The shore power cable comes in to the 30amp main breaker with its black wire, the white wire goes to the neutral buss, and the bare copper wire goes to the frame somewhere behind the power centre.

You can see where that bare copper wire is grounded when you pull the power centre out a ways. (Should be some slack in the wires so it can come out enough to see behind it)