On my XG32 there are 2 large gauge green wires coming through the floor in the area between the propane tank and mainframe member. They are connected together to a ground lug on the frame. Under the bed what I think is the same wires, one goes to the converter and the other to the main electrical box at the top.
EDIT adding, there isn't any looping around underneath with this wires. Where they come down through the floor it's sealed up with the expanding foam like in your picture then both go pretty much straight to the frame ground lug. Lug is on the outside, propane tank side of the frame.
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