When you hit an immovable object, (say a bridge abutment), with 4k lbs.
behind you acting as a pile-driver, you're going to wish that you bought a smart car.
In a collision with a smaller vehicle half your weight, I'll concede that you're going to win. just don't tumble off a mountain road. There aren't enough airbags in the world to save your ass when that thing gets tumbling.
And no, I don't hate Suburbans. They are great trucks for what they are. But thinking that they are the last word in safety is pretty uninformed. My Mercedes S500 is safer by several multitudes.