Grav-plates

Grav-plates are a type of levitation device utilized on automobiles before and after the Great War.

Background
Grav plates allow vehicles to levitate across the surface of the ground, utilizing an energy component known as a "recycling power chip."

Location
The Chosen One can choose to have them installed on their Highwayman by T-Ray after having their car stolen in New Reno once the Enclave Oil Rig is destroyed.

Appearances
Grav-plates are mentioned only in Fallout 2.