That's interesting. I thought the Hummer had a standard snorkel which would increase that water capability a bit. My drive in one included a 4 foot deep pool (over 1000 mm), and I cannot believe with its added width and lower roofline it cannot handle more sideslope than the 80. I can't remember how steep we drove ours on, but it was nutty steep. I'm not questioning your numbers, as each mfr chooses what they'll post publicly from a legal liability aspect as well as a reality aspect, but still..
Additionally, trail use rating would require posting their approach and departure angles as one of the more practical measurements of real world capability. Not much else matters out there if you can't get drop off a ledge or get the fronts started on a ledge and also manage the breakover. Nothing worse than the sound of a rear bumper dragging off a rock. Well......almost nothing.....
