After doing a lot of research, I settled on a ProArmor fire extinguisher mount. The extinguisher is in a protective bag, and held on by velcro straps. It is very simple, and the beauty of it is that it can be mounted virtually anywhere on the roll cage or many other places. You just rip the strips then grab the whole thing and go. All that worries me is that getting the straps free from the buckles might be a little slow, and someone not familiar with it might need a second or two to figure it out.