How many vehicles a year do you think get sold to folks who are going to be so far off the grid, they might consider jerrycans for fuel security? 10k? 20k? 17 million new cars a year are sold, for comparison.

I admit you adventurous folks exist (and commend your wild spirit), just not in sufficient quantity to sell vehicles at volume, considering the average American light vehicle use case (a few road trips a year, ~40 mile daily round trip commutes).