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. |