Valley Craft's Gray 48x30 in. Deep Security Truck is constructed of all-welded 2x2 in steel wire grid panels to provide total security and see-through visibility. Optional shelves adjust easily along grid panel using plastic shelf clips (four clips included per shelf). 250-lb. capacity shelves are available in 14-gauge steel or 3/4 in layered wood. Includes flush-mount locking handle with steel rod locking mechanism. Rolls smoothly on 2 swivel and 2 rigid 8 in mold-on rubber casters - 2,000-lb load capacity. Ships assembled - casters - handle - and shelving require minimal assembly. Other optional accessories available: Metal & Wood Shelves - Pegboard & Louvered Panel inserts - Hitch System for towing - Fork Pockets - and 6th Wheel for pinpoint steering.