Both the skid and trailer have their own advantages in having a mobile washing system installed on them. The basic skid package consists of all of the washer components. The water tanks size will simply depend on the load capacity of the chassis used to transport the washer. The advantage of using a skid is that it can be set on or taken off any chassis very easily with a crane, which allows the chassis to have other applications, primarily in substation applications. The washing trailer is the most utilized washer for substation work because it has a fairly good sized water tank – 6000 liters. The second most common reason why it is used is because it does not tie up the chassis for only use as a water tank. With the use of a truck or a tractor, a trailer becomes quite effective at being mobile and able to clean a substation. The trailer is also used for washing transmission lines with a chassis pulling the trailer. Often in this case the pulling chassis can be a mobile aerial lift, particularly for washing distribution network insulator, or in some cases a chassis equipped with an extra water tank.