I would be tempted to surreptitiously add more and more lights to their truck over a period of months. Maybe a bar light at first, but eventually it would devolve into christmas lights, old lightbulbs, etc. It'd be hard to pull off but worth it IMO.
This might be illegal in your area. Might be worth a non emergency call to the cops and let them know the owner always flashes the houses around at midnight not letting people sleep.