Most trucks over here that have lift axles are tippers, it being lifted/dropped by the driver. Some turnpikes charge by the axle and there’s been some disagreements between trucking companies and the turnpike whether the truck should be charged for the axle that’s lifted. If it’s a tipper with a steering axle and two drive axles with a lift axle stuck in front of the drives the turnpike consider it a four axle vehicle whether the lift axle is up or down.