> "With modern tech it wouldn't be hard to control a separate traction unit, with its own wheels, at the front of your vehicle" What you are describing is the

> "With modern tech it wouldn't be hard to control a separate traction unit, with its own wheels, at the front of your vehicle" What you are describing is the tractor-trailer (aka semi-trailer) truck. It would indeed make practical sense to swap tractor units when moving important cargo over long distances where fast charging facilities are unavailable. It's already done today with fossil-fuelled trucks for various reasons. But for private automobiles, the advantages are very niche/narrow and wouldn't be enough to outweigh the impracticalities and disadvantages that you mention.