When I worked at a store we had two sizes of shipping cart and they couldn't interlock but people would force it anyway or back them in to engage the coin latch. The cart sheds became a total mess and the store was too understaffed and the manager often ended up doing the cars, badly, in favor of pulling people off indoors cleaning or w.e. I often left the cart over a parking separator brick so it can't roll into cars, but doesn't add to the jumbled mess in the shed.