Car lift, parking system, refrigerator hourse, refrigerator truck body, semi trailer truck, dump truck, skeleton semi trailer, drop side semi trailer, box/stake trailer, van trailer, refrigerated semi trailer, tipper semi trailer, side tipper trailer, tank trailer, flatbed container, and various semi trailer and so on. Car lift, parking system, refrigerator hourse, refrigerator truck body, semi trailer truck, dump truck, skeleton semi trailer, drop side semi trailer, box/stake trailer, van trailer, refrigerated semi trailer, tipper semi trailer, side tipper trailer, tank trailer, flatbed container, and various semi trailer and so on.