The Slate truck doesn’t have a typical key.

Unlike today’s cars — which pack proximity sensors inside a little plastic box that runs tech that allows drivers to start the engine via a push-start button — the Slate has a simple solution.

Drivers put a square key into a square slot. The instrument display flicks on. A single bell chimes.

That’s it. There is no theatrical lighting sequence, symphony-like entrance music, or enormous touchscreen springing to life.

Even the windows are simpler. They’re controlled by manual hand cranks. In my test, it took six or seven spins before the glass disappeared into the door panel.

The deliberately plain…