What do these two vectors describe? Both are 3 Dimensional, so I would assume that the Forward-vector describes the direction of the car while the right-vector describes the rotation of the car around the center of gravity. However

Quote from w126 :

For now remaining part is calculating wheel positions in world coordinates, necessary to get linear wheel accelarations. We start at X, Y, Z (RAF data block) which is the position of car's CoG. Also in RAF data blocks there are right-vector and forward-vector, which define car orientation in world coordinates. We can also get up-vector, which is cross product of right-vector and forward-vector. They must be all normalized (their lengths must be equal to 1). Then to CoG of car we add:
X (static wheel info) * right-vector
Y * forward-vector
(Z + suspension deflect) * up-vector
The result should be the position of a given wheel in world coordinates at a given time step.

the quote above is what w126 said when we were asking him about how to calculate the tyre load against the road surface for a calculation we wanted to do (Read full thread here). How would the right-vector then have anything to do with the positions of the wheels in the world cooridnates? And if my assumption is wrong, the why are both vectors 3 dimensional?