Good points. My comment about the mobility of the truck camper applies only if we can in fact, find passable surfaces. The point for us is to be prepared to the best of our ability and I think we have done a good job in the regard. We will have a potential survival advantage.
My biggest worry are other, extremely desperate people whom I would be very inclined to help. But this would have limits and things might get gnarly leading into an area I hate to think about - using lethal force to protect my family. Hopefully, simply being visibly armed would be a deterrent, but its hard to game out how bad it might get.
My larger point is really about how ill-prepared most of my neighbors are. The recent storm simply highlighted this problem. We were all very comfortable because we had a generator and alternate, heated shelter. I spent a lot of time helping neighbors. I also had the only vehicle (Outback with all wheel drive with blizzak tires - just amazing on ice) on my sloped street that could successfully navigate ice so I was out buying cat food for my elderly neighbor, and buying groceries for our other neighbors with a new baby.