The Kargo Master Freon Tank Rack is designed to hold either three 30 lb tanks or one 50 lb tank on the top level and two 30 lb tanks on the bottom two levels. These tank racks are built with heavy-duty 1/4"steel bars and 4 tiers of 14 gauge steel shelf plates for structural integrity. Each tier is slightly tilted backward toward the van wall, allowing the tanks to be cradled securely inside the tank rack. The rack is only 13.5" wide which helps to maximize storage space. Nylon straps are included as an extra measure to secure the tanks in place during transit.