An RV is impractical in these scenarios. You are only going to be mobile via vehicle in rare scenarios where you find an abandoned car with fuel or maybe in the beginning of your escape to the wilderness.
Not only will a vehicle be too large to get through tight spots and require fuel, it will also make you a very quick target for people who are panicking.
We're not talking about a lot of devices. We're talking about how long you can sustain a few niceties if you have room in the pack, those being electric light (LED) and possibly a digital device such as an iPod/smartphone. In a scenario where civilization could crumble, you can't discount the psychological impact that a small bit of entertainment can provide.
Other than that, the majority of everything else Marlin and I are discussing is able to be carried by one person if at all possible. If you have the "luxury" items in an accessory pack it's very easy to decide what to leave and what to take based on circumstances.
Much of what is being carried is engineered to be small and require little set-up or preparation.
Space blankets, which can be a lifesaver in more ways that one can literally be folded small enough to fit into a small pocket on most packs.
Etc and so on, but you get the idea.
This ISN'T for camping. This is preparation for a situation where you may be saying goodbye to modern civilization for either an extended amount of time or possibly forever.