Transport Rack. The transport rack is especially designed to allow moving large quantities of tires from one warehouse to another. The racks are stackable when they full and are closes when they are empty. The rack sizes allow transport in a closed trailer. You can stack two high in the trailer. Racks are stackable when open or folded. Specs: overall size 96"L x 66"W x 51"H; tire quantity 70to 100; Num cages / 53' trailer 18 racks or 1800 tires; capacity 4000 lbs.; stackable open 4 max.; stackable folded 20 max.