I purchased my camper as a bug-out vehicle after Hurricane Katrina, and used it to evacuate my family and pets for Hurricane Gustav. As an army vet from the soviet era we were always training for " the balloon to go up" so were used to planning for all eventualities. Naturally after I got out, I maintained this mindset, which has evolved over the years as my threat assessment probabilities have changes. I think my mobile FT retirement plans are a natural offshoot of this philosophy. Certain events, like a severe weather event/natural disaster is much more likely than others, like civil unrest, however I have seen all types of scenarios in my lifetime from killer hurricanes in the south, to earthquakes, forest fires and civil unrest (the Rodney King riots) in Ca.) I have been forced to evacuate my home and leave all my worldly possessions more than once, not knowing if they would be there when I returned. Having a self contained RV that I'm living in FT I will never have that worry, as I will surely take everything with me if forced to leave an area.

Bottom line - I have considered exactly the thing you suggest for very many years. Any homestead or fixed installation could never be secure from a multitude of natural or man made disasters, as it could not be secure or defended, in the worse case scenario. I am planning on a very large solar system, so I can be energy independent off grid. I will have a high-efficiency mini-split heat pump powered by a bank of 8 deep cycle batteries and between 1,500-2,000 watts of solar. This is doable now that solar power has fallen in price and panel efficiency is improving. This gives me the ability to be independent and stay away from the crowd, (boondocking in the desert Southwest) as has been suggested. In cooler weather, it also will allow me to conserve propane use, as the heat pump I'm looking at will provide 12,500 BTUs of heat while only consuming 600 watts of battery power (as long as the temp doesn't drop too close to freezing). An efficient electric fridge/freezer is a good idea too, as it does not consume propane (which may be akin to unobtanium after a disaster, even a limited duration or regional one like Katrina and Sandy brought) especially if you have essential medicines requiring refrigeration which must be stored.

I plan on survival fishing (and hunting if possible) to extend my food stores, as well as foraging and some indoor gardening, as I believe that in a total meltdown of society scenario, gardening or farming will just make you a target for unprepared desperate aggressors who value their lives much more than yours. You may eventually have to defend yourself from small parties of roving brigands, but you will be less likely to need to do so if you don't make yourself a target, and even less likely if you are a moving target with a good communication network of like minded individuals. Water will probably be your most critical item in a desert survival bug-out scenario. Since water is very heavy, so only a limited amount can be carried on an RV, a good portable water pump/access system coupled with a reverse osmosis or other filtration system in your RV is recommended. It would be advantageous to make use of the 7 gallon blue Aquatainers, toad or TV carried water bladders, spare fuel cans, unique vehicle parts (like spark plugs, air and oil filters), tools, etc. Many FTers use these things, like RO and whole house water filtration systems in "normal" (pre-disaster) times too.

Books, blogs, etc. can and have been written on surviving and thriving in whatever scenario one can imagine. You only have to apply and adapt this info and advise to your own particular family needs, capabilities and talents. An internet search will give you more info than you could possibly digest in a lifetime. Some of it may even be worthwhile. ;)

Chip