The eCascadia is an electrified version of the familiar big rig design.
Daimler is gauging whether or not these trucks can thrive in realistic scenarios, and lessons learned from these early models should inform the eventual finished designs.
As it is, this is a symbolic milestone for the company.
It's putting large electric trucks into honest-to-goodness service well before Tesla's Semi is expected to enter production by the end of 2020, even if they're not strictly polished.
That could get its foot in the door with customers who want to see electric trucks perform in real life before adding them to the company armada.