Thanks, gonna refine the design a little more to make for more bending and less welding, I also plan to make a 'skidplate' for the jack since the bottom is likely to get messed up on rough terrain. With the tires/jack mounted this way, a tire change would likely take about as much time as the time it would take to get out/back in the Jeep and buckle up. Plus, he could put a lock on it and lock the tires/jack in place in case to keep slick fingers from walking away with them.
Also, the jack box serves double duty here, it keeps the tires from kicking inwards at the bottom. The Jeep is all jacked up, the center of the rollbar is not necessarily the center of the tub, and the tire carrier setup shows this if you look where it is welded to the rollbar.