The difference between trailers: a tractor is a vehicle with only a front but no cargo compartment, a trailer is a vehicle without a cargo compartment welded on it, and a dump truck is a freight truck with its own lifting and lowering columns, which is mostly used to transport scattered goods.
A full trailer refers to an ordinary car with a full trailer compartment added to it, and the two are connected by a hook. A full trailer can increase the loading capacity of the truck, reduce fuel consumption, and thus reduce the cost of transportation.