I am quite sure they also don’t offer USB ports to charge the phone you run in lieu of a build in system

I definitely read an article somewhere where it says that they provide USB power for the tablet/phone.

kagis

This article has it (though I don’t know if it was the one I saw):

roadandtrack.com/…/slate-truck-ev-pickup-truck-su…

The Truck will come with a phone mount and convenient USB power to mount your phone or a tablet to the dash.