The ET3 is a civilian vehicle. This six-wheeled transport has a cockpit for the driver in the right front of the vehicle. An example of this vehicle is used by the Blue Suns for their operations on Sanctum. Another is found on Haestrom; whether this points to the vehicle being old enough to be from original quarian habitation or if it made its way there more recently is unknown.
This type of vehicle, like the M29 Grizzly, is low to the ground; however, unlike that military transport, the wheels aren't covered.
Like the Grizzly, this vehicle is not usable in-game; it exists merely as scenery.