1. A MILK HANDLING, HAULING, AND MERCHANDISING SYSTEM COMPRISING: A STORE COOLER AREA BEHIND A WALL PANEL INSIDE THE STORE, INCLUDING AN ACCESS OPENING FOR CUSTOMER ACCESS THE MILK CARTONS; COOLING DUCT MEANS IN SAID AREA ADJACENT SAID OPENING; SAID AREA INCLUDING SMOOTH CONVEYANCE FLOOR SURFACE ADJACENT SAID OPENING TO RECEIVE WHEELED HAULING AND DISPLAY VEHICLES; A PLURALITY OF WHEELED HAULING AND DISPLAY VEHICLES IN SAID COOLER AREA, WITH ONE VEHICLE BEING TEMPORARILY ON SAID CONVEYANCE FLOOR SURFACE ADJACENT SAID OPENING; EACH OF SAID VEHICLES INCLUDING FRAME MEANS, A PLURALITY OF VERTICALLY SPACED SUPPORT SHELVES, AND VERTICAL PANEL MEANS FOR RETAINING COOLING AIR FLOW OVER SAID SHELVES; AND SAID VEHICLES BEING CAPABLE OF RECEIVING MILK CARTONS AT A DAIRY, OF SUPPORTING SAID CARTONS TO THE STORE, OF RETAINING SAID CARTONS IN THE STORE COOLER, AND OF DISPLAYING SAID CARTONS ADJACENT THE ACCESS OPENING OF THE COOLER FOR SALE.