The Dutch company Leenaerts Born added a DAF XF to the fleet with a hydraulic driven front axle. The tractor is pulling tipper trailers so offroad capability is important. With the hydraulic driven front axle, build by Ginaf the DAF has traction when that is needed. The midlift axle is just enough to comply with legal axleweight limits. Offroad and when driving empty this axle can be lifted.
The great benefits of the hydraulic axle are less rolling resistance than with a fully driven front axle, the system is lighter and more compact.
Source: www.bigtruck.nl and www.bouwmachineweb.com