I have the GM Sliding toolbox that works with the cargo management system. This is the large box that goes from rail to rail, not the smaller ones that clamp on and can be carried off. All installation hardware and brackets are included. The box usually sells for $550 from the dealership so I'm asking $400 firm. It was on my truck for approximately 2,000 miles and was covered by the tonneau for most of that time. I have a 5'8" bed and the box was just too big for my taste in a bed that small. It would be a perfect fit for a 6'6" bed and the sliding feature makes it really useful and tonneau friendly. I thought I'd keep it until my next truck and then I found out that I've got a baby on the way, so I'm trying to sell this to get the money for the crib. If there aren't any takers I can always keep it and use it for storage, but I thought I'd offer it up first. I'm in Eastern North Carolina, local pick up only please. I may be willing to make a short drive to meet up somewhere if it's within an hour drive.