I have seen the aftermath of a fairly moderate speed crash on a TV documentary showing tests recently carried out by the Road Research Laboratory, and was horrified to see that a metal tool box full of metal tools in the boot (trunk) of the test vehicle had gone through the rear bulkhead, and back seat, opened , and causing spanners and wrenches to be thrown all around the car, causing what would be horrific injury's to the occupants , who were fortunately test dummies, it certainly made me think
Father in Law knows all about that. He crashed his Ford Zephyr into something in the early 60's. Had a heavy toolbox in the boot which decided to keep going......
Through the back seat, and was stopped by him sitting in the drivers seat. He still has problems now