I've seen 2 cars rolled in the last 2 years at OR RallyXs. Both were full rally car setups, running rally tires. Don't know what the pressures were, but they obviously were too low
Both incidents occurred when the car was sliding sideways in a very rutted tight corner; peeled the outside front off the bead...
There have been several other people who've peeled tires off the bead also, but not with drastic results. Afaik none of these were running above mid 20's pressures (but not first hand info about that).