I have wanted Montezuma - XL450B - 36-Inch Portable Toolbox
https://mechanicguides.com/best-tool-box/ for a while now and finally I have one. However instead of mounting it to the bed of my work truck I built an angle iron base frame with rollers so I could roll it to the back of the flat bed when I need it. And roll it up to the back of the cab when done. Two locking hasps keep it secured to the back of the cab when not in use and keep it from growing legs when no one's looking. One really nice feature of this box is that all of the sockets, wrenches, screw drivers are securely held in place when the lid of the tool chest is closed. This keeps my tools from wandering around the inside of the box while I'm driving around the ranch. Another nice feature of this style tool box is that every tool is visible and within easy reach, no more hard to open drawers to dig through, no more hidden tools rusting on the bottom of that old box. And the powder coat paint all but eliminates scratched and chipped paint. This tool box is built extra heavy duty, with thick metal and no cheesy spot welds. Great construction, made in America, just like in the good ole days. My only regret is that I waited so long to buy one. I highly recommend this tool box to the serious minded mechanic or farm hand who needs a good solid reliable tool box or road chest. Well worth the money!