We use them always! We also do not park in any client driveways. If the truck leaks a drop of oil, a trailer ramp gouges their drive, spill gas on the drive, any little thing can be used against you. Our cones are marked with out business name, we have a friend who purchased military stencil machines and makes us what ever stencil we want. Then a little paint on the item through the stencil and your equipment is marked.