I keep a 72 hour kit for two (my wife and I) near the bed. My pistol and shotgun are within arms reach as well. We have little threat of earthquake, tornados are our main concern here, but I'd think you'd be well served to keep everthing clear of your house/building.

Perhaps you could store a select firearm (I'd go with a shotgun, but that's just me) in your camper when not in use in a hidden area. Underside?

My truck kit would suffice for two for 72 hours but is mainly designed for a one person "bug in". I keep a pistol in my truck.