Überchassis
From Halopedia, the Halo wiki
Überchassis is the name given to the car that is sitting on the pedestal in the offensive base of Terminal. It can also be seen in various places in Outskirts and Metropolis.
Über, thought to be German for super but actually means over or about, and chassis comes from the Latin word for case, so the Überchassis could also be known as the "super case".
It is similar in size and function to the MLX, albeit seen more frequently.