I have been reading postings and have decided to share some of the re-decisions made in our home over the years about storage of all the stuff one needs to survive for a period of time.
We eat potatoes, wheat, oats and beans in fairly large quantities.
Potatoes need a cold room or root cellar to store well, we eat 400-600 lbs per year. One cube palate sized
footprint. Left over potatoes when the new crop comes in are burried in the garden to feed next years heavy feeders.
Wheat and beans are stored in large garbage cans/55 gal barrels with lids (food grade) with food grade liners, purchased for the purpose and kept in an unheated outbuilding.
I am not sure how much wheat we actually eat as we share it with the chickens and simply fill up the containers with bulk purchase every fall. We have found that the VitaMix (purchased at an estate sale unused for $40)turns whole grain wheat into flour quite nicely and for something other than whole wheat we use a flour sifter. Pasta is made from the same wheat, we like it better, and we purchased a pasta roller. We still need to add a hand grinder just in case, however for short term outages or brownouts keeping a week or so pre-milled works just fine.
I like to keep 5 or 6 kinds of legumes in the same manner and buy them farm direct in rotation. We probably have a five year supply and buy only one kind per year. When I want to grow one of them I take the seed straight out of the edible inventory. We shop for this stuff once maybe twice per year and get the bulk salt, borax, vinegar, sugar, olive oil, etc at the same time. We also get the vegies we haven't grown and are available locally at the local (day trip) organic market. These get stored in the cold room with the potatoes and some of them get dehydrated when I get that far.
A barrowed or rented 1/2 ton truck can collect the whole years worth of food in a day .
The point of this is that storage capacity is the limiting factor for long term storage of carbohydrates. Plain square footage that is intrusion and weather proof. Any producer/processor of a food product shipped bulk in 55 gal drums probably has some rejects usually dints/scrapes/dirt(washable) at reasonalbe cost as well as the food grade 10 mil plastic liners. If you have a building, buy enough storage for your projected capacity/need and then fill them up. $1000 would likely cover the cost of filling them up.
Oats get a slightly different treatment. We buy bulk slow cook rolled oats, in 50lb paper institutional bags and put the whole bag in a 55gal drum. We use 2 of these per year and 2 will fit into the drum with space left over.
The left over space has corn meal, and sometimes rice in much smaller quantities.
The outcome is we do not have to find secure storage space and manage inventory rotation for the sub products. Whole grains also store better for longer and double as seed.
Should we have to move in a hurry, I would take the equipment and some cash/tobacco/etc, and fill the extra traveling space with more concentrated foodsuch as nuts and honey and cheese along with seed. Moving grains/potatoes is just not a quick and easy undertaking no matter what you do, that is unless you have a semi handy and good roads and fuel and security.