Drones instead of vehicles

Due to the ever-growing conveyor belt salad, it would be very helpful if there were transport drones in the endgame. Alternatively, transport helicopters

I prefer mid game. Maybe at the time Construction tier 3 things are available. By end game I'm pretty much done and no longer need this stuff.
Would be very helpful with the Game Map with the really high mountain though.

I wish for this but somewhere mid-tier or after researching where nuclear energy is at, with the dump trucks will probably do fine.