Tyres don't just peel off, I'm sure you know that, the force required to unbead the tyre from the rim is quite substantial and could only be caused by the rim/tyre impacting the gutter or pot hole from hell
I have seen tyres go flat and people drive on them until the side wall separated from the actuall tyre, but the bead was still attached to the rim.
As for capacity, on the street the rb30 would always be the best choice. cause I like drive up a hill with my a/c going and not have to change from 4th to second to get up there