FWIW. The guy that does seasonal service on my HVAC had an off road experience that resulted in crushed vertebra injury. He was driving a full size Ford wagon and left the road and was airborne, one of those N. GA roads where the road is higher than the pavement. Since it was a normal 'merican car the seat had some give to it. I guess I'm saying, there's only so much you can do to prepare for bad situations, but you can't make it foolproof.
Its good that Shane and my HVAC guy are around to tell their experiences, I'll take luck any day of the week.
For instance, Saturday a crew was removing some trees for me. The trunk section of a tree, about 12 ft tall fell badly and pinned the sawman. fortunately they had a log loader and were able to lift the 1500 lb trunk and free Les. He was transported to a local ER, no internal injuries, but a broken hip/pelvis. It could have been worse.