The engageable all-wheel drive system propels the vehicle steadily forward even on difficult terrain. To prevent any of the wheels from spinning, differential locks can be engaged. The single-tyre concept is also well thought-out: the rear wheels follow in the tracks made by the front wheels using the already compacted surface for added stability.

The engine has been positioned in a central position under the cab. This results in a balanced axle load distribution, which has a positive effect on vehicle handling. When the Unimog does have to stop, it does so with the pneumatic braking system with off-road ABS, automatic load-dependent brake force control (ALB) and disc brakes on all four wheels.

At the core of the Unimog U 4023 and Unimog U 5023's all-terrain capabilities is the cranked vehicle frame with welded tubular cross members. Thanks to its torsional flexibility in combination with torque tube technology and the 3-point mounting of engine, transmission, cab and body, a diagonal torsion of up to 600 mm is possible. As the frame is completely welded, it possesses great torsional resistance. At the same time the cranked frame makes possible both a low centre of gravity and high ground clearance. The Unimog portal axles also ensure this. The asymmetrical arrangement of the axle differentials makes it easier to ride over obstacles.

Short frame overhangs at the front and rear result in large approach/departure and ramp breakover angles, so that hardly any steep terrain presents a difficulty for the Unimog. In addition to this: components protected from water ingress, the raised air intake tube and ventilation ducts make fording of water with a depth of up to 800 mm (optionally 1200 mm) possible.

By connecting the axles to the transmission by means of torque tube and thrust ball, an axle articulation of up to 30° is possible. Encapsulation of the drive shaft protects against contamination with dust, water and other outside influences when driving off the beaten track.