Safety concerns and crash data for Class A's?

It is a legitimate and genuine concern. If you are going to make crash worthiness part of your criteria don't look at a class A - unless it's a Prevost or converted bus. Despite the lack of crash testing, in the event of a roll over or side impact the house will do very little to protect occupants - probably worse and simply collapse. I think the "safest" drivable Rv would be a Super C. You get the advantage of height, plus a large diesel engine in front of you. Not cheap and not as readily available but they are out there. As others have stated it's not just the crash itself and the RV, it's the tons of stuff in the RV that become missiles - dishes, cabinets, microwave, TV's. You are driving an apartment, imagine crashing an apartment - with up to 100 gallons of fuel and propane on board.