I don't have any experience of dealing with such systems. For my understanding, it's absolutely functioning.
I don't see any problem or issue with the trolley. The item "Vintage Unloader Hay Trolley with Pulley and Hook" is in sale since Monday, April 03, 2017. This item is in the category "Collectibles\Tools, Hardware & Locks\Tools\Pulleys, Block & Tackle". The seller is "sasha_poz68" and is located in Lutherville-Timonium, Maryland. This item can be shipped to United States.