Am I a threat?

I’ve spent the past week in Crescent City, California. And I’ve parked at night in four different spots several blocks from each other. No problems—until last night. A police officer came by while I was still up. Oh crap, what now? He said someone had called about a suspicious van. His tone of voice seemed to convey he thought this was a silly thing he had to do. He was very nice about it. Almost…