SFI roll cage padding.
I have the kirky head bolsters, yes they will keep my head from hitting the cage but man they suck for changing lanes..
Honestly that just may be the best way.
Some rear view cameras and head bolsters..
When I drive on the street I'm wearing 5 point harness pulled tight. It's just the play in my neck that worries me. My neck and back have taken some serious damage already, not to mention the damage I've seen as an EMT.
I fully understand what damage can be done to the body in even a minor accident.