gas cans!? the way we generally range extend a gas vehicle is to pull into a gas station and a couple minutes later you're on your way again.
For electrics, gas cans would be additional heavy batteries, while filling stations have the longer refill time, which can fit your schedule (recharge while at work) or not (stop to recharge every few hours on a long drive).
(please don't all start telling me about quick charging and a list of neat things to do while you wait and how the mindfulness is overall better. I'm just making a comment about available means to extend the range of a car)
in the transition phase (horse to car), a farmer with a model T could use a horse and buggy to bring a gas can to a stalled car. Would have to tow the battery car to where there is electricity and a rectifier. Look up "rural electrification program" to see how little electricity there was in the hinterlands at that time.