Since many of us in this forum carry our bob/ghb/whatever in our vehicles this applies to us espically. I keep a kit under my drivers seat in a small waistpack/daypack bag. Under the seat is a tight squeeze and makes me leave some larger items out but its within reach if I do get in an acccident. I took the belt for it and hooked it to the side hooks on the pack and put it around the seat frame so hopefully it will stay put. I'm preferring soft sided bags over hard storage so I can squeeze them in places and fasten them down well.
So thats one main item we should all keep in mind, keep some gear within reach and keep all gear fastened down in some way.