Let's talk non-steerable Tag Axles

[RussWhite]

While parked in the lot at the American Museum of Science and Engineering at Oak Ridge Tennessee I observed a Prevost tour bus making turns with his tag axle wheels completely off the pavement.

I don't think my axle will do that, but I do have a three position switch with some control of how air to added and released from the air bags between the tag axle and the chassis frame.

I have had a brief discussion of the switch with a tech at the factory and read the owner's manual, but would like to have the thoughts of other forum members on how they use their tag axle switch. The manual suggested the down position to dump the air and get extra weight and traction on the drive axle. The tech suggested using the top position in conjunction with the HWH "raise" button for increased suspension clearance in very low speed situations. How do you folks use yours? How do you know the center position puts the right amount of air in the bags?

Thanks, Russ