Pull up the floor mat and insulation- find a piece of aluminum 1/8" or so thick (I've heard that road signs are about that thickness)- cut amount needed to completely cover the bad area with plenty left around edges- use large hammer to "custom fit" aluminum to shape of floor plan- pop-rivet aluminum to floor- install insulation and floor mat.
It worked on my old, uhh, a old 4x4!
Old Turd- Deplorable- Unrepentant Murderer- Domestic Violent Extremist
