It has bumpers - you just can't see them. The purpose of "bumpers" is to absorb low-MPH impacts and deflect the energy of a collision. Somewhere in the '80s, the auto industry decided the big, obvious chrome bumpers were unsightly and covered them with plastic. Underneath that fiberglass you will find bumpers that are designed to function just like their more obvious predecessors.
Now the question is what does your DH think the function of a bumper is and why does the apparent lack of said bumpers concern him? If he's looking for something to push stuff out of the way, he's going to want to fabricate some sort of push bar(s). However I think it's best just to avoid hitting stuff with your RV.
