Everywhere we camped in S Ariz last month people had lights under their rigs. We only have running board lights and left those on, took precautions about food etc and had no problems but we didn’t stay anywhere more than two nights. Long term, I’d check into lights. Blue seems to be a thing.
Pack rats. Yes. I was there for two weeks in early Dec 2020 and repeatedly found evidence under the hood of my truck they were present. Ate some of the insulation around the battery box and left deposits. Fortunately no damage to the wiring, but the Campground Host had problems the year before. Told me of a story he had about $700 in damage. That's why a number of people park with their hood up and/or put rope lights under their vehicles.