Nearly all of my accidents here have been rear-enders, mostly after I was already stopped. 
The trailer hitch is a great idea.  The bigger, the better.
Sue 
Collision deterent and letting you move anything from trailers to bicycle racks: A trailer hitch is a true multi-purpose item! 
Lots on good points on the benefits of defensive driving. But effective risks minimizing strategies won't save you from every single oddball idiot out there.