Colin,
Thanks for the illustration.
Obviously it would be the pressure applied by the driver, and not the pressure from the wheels that breaks it?
I guess that means one must go against the natural reflex of "grabbing and pushing" the steering when landing after a jump to having a "soft-elbowed lightish grip" on the steering and fully trusting the seatbelt to hold you back. That will take some learning, and it will risk turning the car in the landing - risking a roll-over. When I landed, that was the one (probably only) thought in my mind - "keep it straight or roll!". And I hung on to the steering for dear life!
I guess it will take some learning (and "unlearning" of bad habits)...
Regards,
Anton