Junk,
To clarify, I have 2 bros in law and this one has never married - still looking for Miss Right I guess. We were talking about the ideal vehicle once and it varies by what's available but has some basics. Something AWD, stability control, ABS, front/side/head curtain airbags, heavy as possible, low CG as possible / high floor as possible, and German helps from an extreme survivability standpoint. For a new car, the Mercedes R class seems to be the very definition and even has air curtain bags to the third row. For a used car, a 100 series LC/LX from 03 up (got side curtains and stability control), and used Audi A8s from 97 on would both be near the upper end of survivability.
Stability control is highly effective and will help reduce rollover likelihood because they focus on keeping the vehicle from yawing. Even when you are not touching the brakes, these systems apply the brakes in proper sequence to keep the vehicle from getting sideways and then rolling. Amazing stuff in his opinion. He reports in a cone slalom that they can get their best time for the day through the cones with an SUV's stability system on, then spend hours the rest of the day with the system off trying to beat it. You just floor it and blast through the cones with the system keeping the rear from stepping out of line (which slows you down).
As for springs - yes they do soften over time. Shocks are a far bigger factor however in terms of dangerous handling from wear. Tires. Totally separate debate that would go on for pages.
Best advice is that which we know to be true. Slow down, keep a heightened sense of awareness, and buckle your seatbelt. I found it interesting that in the case analysis they found that her head would not have come closer than 3" to the roof when the truck was inverted with her belt on and an uncrushed roof.
I know this isn't an exciting topic but I still want to be bantering with, sharing information with, and hearing from all of you years from now. For everyone reading this, the most dangerous thing we do every day is get behind the wheel of any vehicle.
Dealmaker - congratulations on properly restraining your family. Well done.
DougM