How to make a toolbox for a Land Cruiser (or any SUV)

I got a Land Cruiser last year, partially because of the great cargo area in it (with the back seats removed). Since I got it, I’ve been wanting to build some sort of storage to hide and store tools as well as the typical gear you should keep around (first aid kit, roadside assistance kit, straps, jumper cables, etc.)  I finally got around to it, and it’s already a lot more useful than I expected! Recently I did an install for a desk and had to take several tools with me in the back of the truck.  After the install was complete, I was hungry for a local burger place. Unfortunately, I didn’t feel comfortable leaving…