May 29, 2021 · The simplest trailer can carry from 450 to 500 kilograms of cargo and can hold approximately 8 full bags of potatoes. If you study the drawing, it becomes clear that the self-propelled cart will consist of such typical elements as a body, carrier, frame, wheels and others. The frame will be best welded from cut tubes with a round or rectangular cross-section, as well as iron corners.