Someday they’ll offer diesel-electric cars and trucks (like train locomotives).
They do have diesel electric hybrid trucks and buses now.
I worked on them before I retired.
But you need a direct drive transmission for cruising.
The edrive is too inefficient.
The only reason trains don’t have mechanical coupling is because it’s too complex with all the drive wheels.
Study mining haul trucks as a comparison. Mechanical drive has obsoleted electric drive all the way up to 300 ton rigs.