HOW UGEARS HEAVY BOY TRUCK VM-03 TRAILER WORKS\nThe Heavy Boy Trailer hooks up to the Heavy Boy Truck with an automatic coupler. Use the mechanical conveyor to load goods and packages into the Trailer. Though designed as the Heavy Boy Truck addition, Ugears Heavy Boy Truck Trailer can be used by itself. With some small potted plants loaded into, it makes an eye-catching wheeled mini-garden, or can become a unique display for your favorite small things. Like all Ugears mechanical model kits, the “Heavy Boy Truck Trailer” is made with high grade natural wood materials and comes with everything needed for an assembly. Follow the steps in instructions manual included with each kit. Ensure to assemble the smaller parts first, then form the larger blocks, such as, wheelbase, body and a conveyor. And finally, put all the elements together to complete the whole model.