The other day I was out in the country (about 2 hours south of St. Paul) and there was a self storage site that had no fence or exernal security. The Self Storage site was just the storage buildings in a field. Perhaps if you chose your escape route and stick to it there may be a storage site like what I saw. This way you could rent out and stock up a self storage place that has no fence nor is it in a facility that you would have to break into.

With this plan you could easly take your planed escape route drive to the country and go to your stash then be on your way with your stored supplies.

Granted this is not a "cheap" way to cash your gear, but it would be secured bigger than a PVC tube.

you could even push this to the extreem and keep dirt bikes, four wheeleres, but now I am waxing over zelious.

Also if you can afford it you could pay for a year in advance and only have to worry about the storeage place once a year.