| For all vehicles manufactured, modified or retrofitted with |
| liftable or variable load suspension axles after October 30, |
| 1991, liftable or variable load suspension axles are permitted |
| only under the following conditions: only one liftable or |
| variable load axle may be present on the truck tractor and |
| only one liftable or variable load axle may be present on the |
| semitrailer; liftable or variable load axles must be located |
| on the vehicle so that they are legally part of the tandem |
| axle group or tri-axle group as appropriate; and the axle |
| weight rating of liftable or variable load axles must conform |
| to the expected loading of the suspension and must be 20,000 |
| pounds or more. |