When i did it in the car, I would finda large parking lot with big puddles of sitting water and park in the middle of the water. Figured nobody would bother walking through a puddle to bug us. If i was going to do a car today, I would go find a corner in an empty parking lot, maybe next to a dumpster. On the one hand you have very little cover, but why would anyone bother you.
You should definitely do a short stay or cheap motel.