Would there be any point in having a homestead with a tractor and various other vehicles which run on fuel, as if the grid goes down or there is a prolonged fuel shortage these items would be useless. Should preppers be training horses and getting the right equipment to plow fields and other homestead tasks? Can a pair of oxen even be bought in the US or UK anymore? Do they still make yokes for animals to pull farm machinery? A lot of people in developing nations have the upperhand in that many still use animals in this way so a fuel shortage wouldn't affect them.