Those warning stickers in the states are a result of the general public shifting from regular car models with low centers of gravity to SUV like models with a higher center of gravity. The gov't did all sorts of tests after a number of Subarus and Ford Explorers (2 doors, short jeep like) flipped in accidents both at high speeds on the highways and being t-boned in a collision. If the general public had not driven 4WD or SUVs before, they did some stupid things driving.All SUV type vehicles because of the high center of gravity have that warning. Lots of us have done some crazy manouvers it is not an issue.
Bingo! As for the Soul specifically, I have zero concerns about rolling over. Its based off the old Rio and as such really doesn't have that high of a COG. Mine has done well in high speed avoidance maneuvers, with both the stock suspension and the Eibachs.If you try hard enough you can tip anything.