The Groves Truck Mounted A-Frame Rack is the perfect solution for transporting stone in an open or closed truck. This rack has a total weight capacity of 24,000 lbs. It holds up to 12,000 lbs. per side. Six mounting plates used for bolting to truck or trailer. Bottom U-channel is 4″ wide with 2″ side ledges and is designed to hold 4 x 4 wood blocks.