Simple, low-tech DIY rear cargo shelf complete! - Toyota FJ Cruiser Forum - I often times need to transport my gear from workplace to workplace, & I really don't like to just pile it in the back. So, I needed a more organized way to pack it in. Hence, my fairly inexpensive solution is here. It took me about 12-15 hours total to build, and I think it turned out decent. I made it all easily removable, in one piece. I reinforced the shelf w/steel wall shelving backets, so the shelf won't sag.