Even besides this aspect, it’s an idea that borders on fantasy because it would require every vehicle to have the same size and shape of pack (or perhaps a few different variations) which would require every manufacturer to agree to the standard and build all their vehicles around it.

Furthermore, it would also require a ton of labor to be swapping millions of packs every day with no end in sight. This also introduces a ton of liability because what happens when people fuck up and a car bursts into flames or the pack falls out on the highway, which even if rare, will be happening frequently with volumes this high especially in a job that probably would be considered low skill and low pay (like a fuel attendant job).