depending on how the world falls apart is your first problem..if your talking nuke then EMP will pretty much take out any luxuries that you have..a simple lightning strike here a couple weeks ago took out power to a whole county including the wally world and the mall where i work..if the mall didnt have a small generator then the entire place would have
been dark..the other problem was it also took out the repeater for our walkie talkies and the sprint cell phone network as well(anybody using sprint towers was out of luck)...if you MUST have these items(fridge laptop lights etc) then your best and proably only option is to go solar at your cabin..but your talking research, time and money to be invested and you would have to start soon to get it all done..and if one does go solar you would have to either buy converters for things that cant be found using 12 volt electric or go without..yes there is a fridge that uses 12/24 volt power.. i think you and your wife need to sit down and rethink priorities and under what disaster conditions will things work..
but i do have a question for you: if problem is a nuke or other emp device then what type of vehicle are you using to pack your stuff out with? as i understand any car that is less that 20 yrs old will be worthless..