Ever since I got the Rolling Steel Tent I've had the idea of adding bogus fleet numbers. I finally did it. (It has been a low priority, after all.) I don't know if it will actually help my van pass as a no-threat work truck, but it satisfies my design sense.
Why 013? Because it's my thirteenth vehicle. And because I started my nomadic life in 2013. Why the zero? To be more cryptic.