A refrigerator or freezer is provided with a chilling space for receiving refrigerated or frozen products and a holder for a support tray for the products, the holder at most projecting only insignificantly beyond the wall of the chilling space. The device including an encoder assembly having a support attachable to a structural component of a rig wherein the support has a pivot joint coaxial with a load arm axis. The cleaning composition has between about 0. The deck returns to level, the sides latch to support the floor and the trailers are ready to be reloaded.