McCullough Wright Medium-Duty Hoppers are perfectly balanced—roll forward when loaded and unlatched and automatically return to upright locked position when empty. 1/8" (11-gauge) sides with 3/16" (7-gauge) base. 4000-lb. capacity. Features: continuous welds, 3"W rockers, strong, latch, formed smooth edge around top, and extended sides on pouring lip. Hoppers can be used with optional casters, with a forklift truck, or both. Made in USA.