AVION Travel Trailers

I noticed today that my 110v panel has two grounds. The ground inside the 10awg romex that feeds the panel, which is to be expected. I also noticed there is a separate stranded ground wire that also attaches to the ground bar in the panel. I imagine this stranded ground is bonded to the frame of the trailer somewhere.

Since the panel in an RV works like any other sub panel, why the separate ground bonded to the trailer frame? I understand the 12v stranded ground bonded to the neutral bar attached to the skin in the pic, but why is there a 110v ground wire bonded to the frame?

As I think about this some more, I think it makes sense that the 110v panel is bonded to the trailer frame. If a 110v outlet, wire, or appliance were to short out to the trailer skin/ribs/frame, then the stranded ground bonding the panel to the frame will provide a path for the electrical current (back to shore power ground). If the 110v panel were not bonded to the frame via the stranded ground wire, then the skin would become electrified.

just to update this thread. Those two stranded grounds pass through the floor and under the trailer and are bonded to the frame. If you need to replace the rear floor, you will likely cut them, as I did. When replacing them, 8 Ga is sufficient