blu,
I would rather take one in my Bolt than in the PT Cruiser...at least theres some metal in front of me in the truck.
Roll Over ...dont even say them words....it bad Karma!
But with the rounded cab? I would bet it would have enough structural support to keep it intact for a minor one but like anything else it wil only hold as far as the impact is severe.
Back in my younger days I had a VW Baja bug we would intentionally roll it over for giggles...worst thing ya had to do after was smack the center of the roof with a fist to pop out the dent.