Utility Ladder Racks for enclosed trailers and utility box truck roofs are available in aluminum or steel, black or white from RackWarehouse.com. All Box Truck and Enclosed Trailer Utility Ladder Racks are sold as single units so you can order the number of crossbars that will best suit your specific needs and budget. Box Truck and Enclosed Trailer Utility Ladder Racks are ideal for carrying long loads of lumber, ladders, conduit, pipe and other construction materials - that won't easily fit inside. Box Truck and Enclosed Trailer Utility Ladder Racks are available in Top Mount or Side Mount configurations and in a variety of crossbar lengths.