We've got a fifth wheel (more secure than a tent, obviously), with an alarm system, because my husband's so insecure that someone's gonna come along and steal something.
One time, we got back to our site and the alarm was going off, and he was CONVINCED that someone had tried to break in.
Turned out, the cat had set off one of the motion sensors (which he had also been convinced he'd turned off in the room the cat was in.)