On ours Unimog U1250, we have recently gone over 35 degrees, but the was turning at the bottom of a dune on an entrance to the beach and we had a sand wall on the one side so that we could not really fall over, but we didn't hit it, just hanging on was difficult for my co-pilot. We try not to do side slopes, just too scary. My co-pilot tends to get out the truck when we go over 25 degrees. In our last trip, a section down to Point Malcolm had section of track had us at 25-30 Degrees for quite a few hundred metres, so we took it very slow. Dynamics stability is very different from static, and it would be easy to roll at higher speed than doing things very slowly. Our low range is very slow, and we use it if we have any side slope at all. .
Our truck is 3.3m high, but with a narrow wheelbase, however, apart from the spare wheel on the roof, there is nothing heavy above the COG - which is around our floor level. We don't have lots of cupboards above head height, and try to keep all the heavy things as close to the floor as possible.
This was the scariest, with the rear wheel dropped quite suddenly as the sand gave away we rocked quite a bit before stopping, and even then we were sinking slowly into the sand as the wind was blowing the sand away from the rear. I dropped the tyre pressures on the other side as quickly as possible before lowering the ones on this side, then was able to reverse down the hill, turning to straighten up. This was quite dynamic, as we stopped pretty quickly when the back went down.
We have in past done some side slopes that had the roof bars leaning on a tree, when it came to the end of the bar, I took it really slowly so minimise the dynamic effects. I would love to see what our actial tilt limit would be on a static tilt table.
