I added that Harbour Freight toolbox to my ROO 21ss. I had to move the propane tanks forward, and slit my propane cover make it fit. I store two batteries in it with pieces of hard foam rubber and plywood covering the batteries. I strap batteries down with bungees. That leaves room in the back of the box for the bars. I ordered new locks and cylinders from Global, and was able to change out the toolbox to the ROO keys. Now I only need one key for my ROO. Life is good. I mounted my charge controller for my solar battery charger on the outside of the box.
2009 Roo 21ss + 2007 Superduty 6.0