heavy duty box trailer 1)different colour and types. 2)plastic or steel tray. 3)heavy load and can be easy ... to tow. 4)good se heavy duty box trailermodelLoad capacityCastorL/W/HN.W.G.W. ... ,hand trolleys, platform hand trucks, garden carts ,sand beach cart, cement mixer, snow shovel, rubber wheel and other tools. ... ,your soon reply will be highly appreciated heavy duty box trailer