If a box truck and trailer are reversed up to a loading ramp, it can be completely loaded and unloaded without the driver having to uncouple the trailer. In refrigerated vehicles, the weak point is the transition between the trailer and the truck, as this is where the cold can escape through the open end walls, interrupting the cold chain. The cold chain is maintained by fitting a bellows. The bellows are concealed inside a rubber lip and are only extended pneumatically during the loading process. During the journey, the bellows are completely protected by the enclosure. The patented system was first presented by Schwarzmüller at the MAN Roadshow in Munich. You can find out more about the vehicle manufacturer Schwarzmüller here.