Way too low for a tow bar or bumper. If I had to guess some sort of wheeled trolley - eg the ones in Ikea or Bunnings ie low at the front with sort of rubberised plastic bumpers on them.
I believe it is called a "side skirt", you would I reckon have to replace the whole piece and likely need to be painted as well. One of the paintless dent guys might be able to improve it by taking the whole skirt off and getting at it from the other side with a heat gun to try to "remould" it out flat. In any case for what it is assume it will be annoyingly expensive.
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