If the battery is easily replaceable (say 20 seconds without leaving the vehicle) you could use small ones for short commutes and drive from station to station

If the battery is easily replaceable (say 20 seconds without leaving the vehicle) you could use small ones for short commutes and drive from station to station (possible recharging on some roads) or (rent) a big battery for long trips. Other parts could similarly be crappy, have upgrades and the manufacturer could set up a second hand part market. They might even invite even cheaper knock offs.