If you are starting a landscaping business, you want to have 4 ft sides built with plywood and pressure treated 2x4 studs. You can bolt the studs at the top and bottom of the small steel frame of the equipment trailer I showed in a previous post. You will have to build the front and sides and the ramps will enclose the rear to make a large open top box. This will give you maximum hauling capacity for equipment, trees, shrubs, topsoil, mulch, stone, and debris with the ramps to wheelbarrow material or ballcart trees in and out.