[Chester B. Stone, Jr.]

My 2001 has a three position switch, the center position is off, the other two positions are to add air pressure to reduce the weight on the drive axle or to reduce the weight on the tag to allow for a sharper turn. In a year, I have never set for anything except off, which is the center position. Once, I accidentally set the switch to dump the tag air and all of the rear air bags emptied and i skinned my coach. Hope this helps.