Modern cars are computers on wheels - they have more sensors than you can count and are constantly phoning home with telemetry data like your location, speed, fuel levels, sudden accelerations/decelerations, video footage, driver attention data from eye monitoring systems, and hundreds of other data points. Cars have inward- and outward-facing cameras. They have microphones. They have always-on modems. It’s all enabled by default with difficult or meaningless opt-outs, and your data is monetized through brokers like LexisNexis or Verisk.
Keep the modem and GPS running … just install it with a lithium battery or wire it directly to a vehicle battery system and place the unit on a school bus or local city transit bus
Or someone could start a small business offering to do this for people … the business would be to just rent out space on a moving van or transport truck and just fill it with GPS and modem units that have been removed from cars … for a nominal fee ($1 a week for example), you keep all these units powered and just have the truck driven around everywhere working as a regular delivery vehicle.