The eTrailer replaces one of the free-wheeling axles with an electrified axle. This powerful electric axle of the eTrailer supports the semitrailer tractor system on the entire route, in normal driving operation, when starting and when tackling inclines. The electric powertrain helps recover energy (recuperation) during braking. If not all of the electrical resources are required for the above-mentioned tasks, the electric drive of the eTrailer permanently supports the diesel drive of the tractor unit over the entire route with the remaining energy.
In combination with a battery-electric tractor unit, the eTrailer brings about a significant increase in range.