Subaru Trunkmonkey Inertia Technology is based on the laws of physics mixed with the chaos of a drunken Trunkmonkey. Just like the crew on a large racing yacht distributes ballast to compensate for heavy winds hitting the sail, Trunkmonkeys distribute ballast in the trunk of a car to compensate for body roll going through corners and powerslides. Trunkmonkeys are also responsible for keeping body roll to a minimum when getting the vehicle airborne during rallies and other offroad events.