These kars are optional and can be nominated by a rally entrant to travel as their support vehicle. They must be four-wheel drive and be able to help not only safely perform recovery duties for their own team but also assist as an official vehicle if required.
Back-ups are allowed to travel through the rally course, but ONLY at the back of the field with the Sweep Vehicles, or use the Kruise course. *
* (Failure to follow this rule will cause the nominating rally kar to incur penalty points for each violation).