and 120 s of the shopping carts 100 p 100 100 s and the rear casters 110 s of shopping cart 100 s thus according to the invention steering and transportation of a line of shopping carts nested together become much easier especially when the rear casters are configured not to swivel although only three shopping carts are nested in fig7 it should be understood that any number of shopping carts may be nested or concatenated together in order to move the group of shopping carts from one location such as a parking lot to inside the store in this case only three shopping carts are shown for simplicity of description fig8 shows an exemplary construction of the lifting structure 130 as seen from underneath the shopping cart 100 in particular the lifting structure 130 is shown with longitudinal slots 316 314 and 312 engaged to the longitudinal rods 206 208 and 210 respectively and a rear slot 318 engaged to the cross rod 242 the lifting structure 130 may further include engagement portions 506 508 510 that may snap fit to each of the longitudinal rods 206 208 and 210 to provide a firm connection for the lifting structure 130 to the tray 106 and in particular the longitudinal rods 206 208 and 210 in the invention the lifting structure 130 is contemplated as being molded from a material such as plastic fiberglass and the like however it is contemplated that the lifting structure 130 may also be integral with a plastic tray or formed with rods of a metallic tray as shown in fig9 in such an implementation the features of the lifting structure 130 would merely be molded in the tray or formed in the rod construction of the tray 106 providing the same lifting function.