Target is trying to roll itself out of a retail rut . The big-box chain is replacing its entire fleet of shopping carts with a beefier, easier-to-steer model as part of a multibillion-dollar turnaround push to win back frustrated customers, TheStreet reported . The new carts — about 500,000 of them — will roll out over the next few years and mark Target’s first nationwide all-plastic design, according to Fast Company reporting . Target says the humble cart is a bigger deal than shoppers may