This hardy Gorilla Truck™ booktruck hauls it all. Offers six sloping shelves and a 600-lb. capacity. It rolls on six 5″ soft-tread dual-wheel casters – the fixed middle pair makes it easy to get over thresholds by acting as a pivot point. Gorilla Truck™ #21101 includes six sloping shelves. Available in 11 powder coat paint finish options. The Gorilla Truck is a school cart that is the perfect companion to the libraryor classroom. Shelves are constructed from 20-gauge steel and are welded to the 18-gauge steel tubing frame. Dynamic dual wheel casters with soft tread allow for easy maneuverability. Additionally, dual wheels have no saddle that may damage surrounding furniture.