I want a Black (powder coat) Steel HD Truck chest. I saw that Jobox makes one under one of their brand names for our trucks that is 16 gauge steel 60" long 19" high and 20" deep (weighs 120 lbs) costs around $400. Looks like all of the truck chests are around these dimensions. I want a chest because I want it to set under or even with the bed rails. Anyone have one of these in their truck. How are they attached? Any other brands that you can recommend?