Life is about statistics, whether you are aware of it or not. Statistically your wife wasn't your first intimate partner, statistically you were more likely to have picked up herpes and pass that on to your wife than you ever are to get into that accident where your tank explodes. Not meaning to sound crass, but it's true.
Two teenage girls' car was T-boned in front of my house. One girl died. They were in a Toyota Camry. What can be done? Never buy a Camry? Put an exoskeleton on all cars? Things happen, sometimes they are tragic things, but they happen.
An exoskeleton will stiffen the ZJ a lot, but it causes other issues (think access to the body). Judging by your adversity to risk, Metal bumpers (exoskeleton too) are going to be overkill... Not going to 11, but more like 346. But to answer your question, yes rear bumpers can be integrated with a hitch.
Please Don't take this as me making fun, I'm not. My wife is risk adverse too. Sometimes, you just have to let logic take over the fear.