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Good find. I knew the pictures weren't from an LMTV - tires aren't right, and there is a step in the picture - but I wasn't sure what it was from.
Here's a PDF copy.
I don't know the ground pressure, but I can tell you that adjusting the CTIS mode drastically affects it. For example, in soft sand the tires will dig a lot (e.g. it feels like 2-3 rotations of the tire for what should be 1 rotation's worth of forward motion), and when you hit the Sand mode on...