To me tools can mean just about anything used to assist us in accomplishing the task at hand
You may not think of a dump truck as a tool in the normal seance due to the size.
And most might think that a 4 axle truck with a 20ft dump body should be large enough. Well yes and no. at 20 ft you can fill the box with way more sand or gravel than you could legally haul weight wise. But just suppose you need to haul trash or crushed wooden buildings often called fluff and your dump fees are a set price no matter if you have an half empty box or a full one.
in that case you need one of Frank S' dump body extensions
first you take a few measurements send the truck on its way while you fabricate the frame work which will pin on where the tailgate attaches remove the tailgate pre fit the frame work to make sure it will fit put the tailgate back on and send the truck on its way again while you build the box extension add lights and wire it to connect to the trailer plug
when finished the truck returns and you spend 15 minutes removing the tailgate and installing the box while the customer is shouting please hurry you forget top take pictures of the completed project.
the truck returns a couple months later again the customer is in a rush you only get a chance to do a repair inside the old bed and remember to only get a couple of pictures