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I would run the ground to the battery. Or through the floor to the frame. Anywhere to the body, like seat bolt relies on the spot welds of the panels to get back to the battery. Small devices have no problem, but big loads will need more. Yeah, it might work. Might have no problems that you can see. I would put a volt meter on the amp and key it up and talk. See what the voltage drop is and figure out what is acceptable to you. Me, I would want as little voltage drop as possible. As if the amp were mounted at the battery would be my goal.