Hello Chris.
The Ground and truck Installation instructions are a bit vague. Only reference is that if grommets were not supplied, use electrical tape to protect the cables, but not at all clear what grommets, what cables or where. Must, as you suggest, be where passing through sheet metal structure, not heavier plate. Somewhere I have a detailed Parts List for the Installation Kit. A big 8.5 inch by 14 inch sheet of paper. I will try and find it and see if any type of grommets are listed.
David
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