I too am a statistic. I hope you were/are luckier than me. I was on the bench, just got out of my seat belt in the jump seat. Patient needed attention so I had no choice but to be unrestrained. A vehicle pulled off the shoulder in to our path, making a u turn, and we t boned them at 70 MPH. I was thrown in to the forward wall at 70 MPH, head first, and after bouncing off the wall, I slammed back in to it a second time. I was very lucky, so the docs told me. Got away with a closed head injury, compression of my c spine, short term memory loss, PTSD, lower back injury, and now after eight years my disc that was bulging at c5-c6 had to be fused. I had been through over 13 months of physical therapy, speech therapy, neuro psych treatments and after going back to work, discovered I just could not fight fire, and ultimately, can't lift any longer. I agree that there needs to be some sort of safety restraints in back for us. A net at the end of the bench like some services have most likely would have saved me a ton of grief, not to mention almost nine years of physical pain.
For all of you out there that are still in the field, use your restraints when possible, and to those of you who are driving your partner around, be careful, it is their life in your hands. Stay safe out there and take care of each other.