In times of increasing automation of driving functions and the transition into the age of electromobility, the chassis continues to play an important role as the link between road and vehicle. A system that combines the comfort potential and aerodynamical drag reduction of a level adjustment with a particularly high energy efficiency can more easily meet the legal regulations for CO2 fleet emission and the customer demand for a longer range of electric vehicles. In this contribution we present a technical concept combining these aspects in a radically simple solution. This makes it possible to create a chassis that fully exploits the energy-saving potential of a level adjustment function while providing comfort for the passengers. While traditional approaches make use of actuators powered by the on-board electrical system cannibalizing the energy savings, our solution utilizes the energy from vertical excitation of the vehicle. The energy is stored hydraulically, eliminating the need for energy conversion and providing the functionality immediately. While being highly energy-efficient, other advantages of a height-adjustable body such as the on-demand provision of more ground clearance for convenient entry and exit of the passengers and the protection of the underbody containing the battery cells are also achieved by our solution. Ultimately, this work showcases a successful proof-of-concept in a demonstrator vehicle and presents the current state of development. The patented technical design [1] and its functionality are described, results of vehicle tests are discussed, before summarizing our findings.