I generally don't disagree about SUVs, but minivans adhere to the same regulatory scheme: they get their truck status by GVWR>6k lbs., as opposed to by high clearance and steep angles.

I think your issue comes from fuel consumption standards (smaller greenhouse takes less AC) and the unstoppable proliferation of curtain airbags, which won't stop until A, B and C pillars of all vehicles are supplanted by The Pillar, with no windows or ability to see beside one's vehicle, save by cameras.