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The next shot shows the bead breaker attachment for the jack. Some folks will use the whole foot of the jack, with varying success. I believe crushing the whole tyre profile down would have to damage the steel radials.
Here I have placed the jack/bead-breaker under a solid part of the bull bar and the purposefully arced foot of the breaker as close as possible to the edge of the rim. Also lashed the jack to the bar for safety.
Before attempting to lever the tyre off, generously squirt a mixture off dish-washing liquid and water around the bead. In this shot you will also see a very useful full sized tyre lever, the bend and hook on one end is great for levering the the second bead off the rim. (Couldn't manage camera and that maneuver)