Most non Prevost bus style Class A RV's are made the same. There is little to no crash worthiness to them. Some manufactures will put a very rudimentary steel frame around the windshield that is welded to Chassis frame. This steel frame is more for holding the windshield securely in place then added crash worthiness. A lot of Class A's do not even have the steel Windshield framing, so its just a piece of glass, some fiberglass and maybe aluminum between you and anything you come into contact with.
A Class C or even better, a Super C will at least have the engine and some steel out in front for some protection. Keep in mind any impacts to the house area still involve only Aluminum frame and Fiberglass so structural integrity is still easily compromised depending on type of impact. Nexus and maybe some others(very few) use a Steel Frame for house instead of Aluminum which will add some structural integrity.
Bottom line is most Class A's and traditionally built RV's offer little in the way of crash worthiness.
We all take risk everyday, sometimes unknowingly but we do not let that stop us from living ours lives. I choose to a Super C to help mitigate some of the potential pitfalls in safety a RV presents but I'm a firm believer the only thing we take with us in the end, is our experiences and my RV allows myself and my family to have ALOT of them.
A trailer based camper would allow you to travel in a Crash rated vehicle and still enjoy camping. You alone can decide what's in your best interest.