Light commercial vehicles are usually enough to transport goods and people from one place to another.But what about when road conditions are so poor that conventional, delivery vehicles with two-wheel drive make no headway? Or when a driver has to move off of paved roads on construction sites or in gravel pits? For such cases, Mercedes has a wide selection of utility vehicles with four-wheel drive -- from the little Viano through the Sprinter with up to 5 tons total weight to the heavy transporter Vario, weighing up to 7.5 tons. Drive it! takes a look at the advantages of all-wheel drive.